diff --git a/other/java/client/src/main/proto/filer.proto b/other/java/client/src/main/proto/filer.proto
index 6cd4df6b4..5cdcb6a97 100644
--- a/other/java/client/src/main/proto/filer.proto
+++ b/other/java/client/src/main/proto/filer.proto
@@ -139,6 +139,7 @@ message AssignVolumeResponse {
     string url = 2;
     string public_url = 3;
     int32 count = 4;
+    string auth = 5;
 }
 
 message LookupVolumeRequest {
diff --git a/unmaintained/repeated_vacuum/repeated_vacuum.go b/unmaintained/repeated_vacuum/repeated_vacuum.go
index 7cc583f56..90bdeb5e8 100644
--- a/unmaintained/repeated_vacuum/repeated_vacuum.go
+++ b/unmaintained/repeated_vacuum/repeated_vacuum.go
@@ -4,6 +4,9 @@ import (
 	"bytes"
 	"flag"
 	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/security"
+	"github.com/chrislusf/seaweedfs/weed/server"
+	"github.com/spf13/viper"
 	"log"
 	"math/rand"
 
@@ -19,8 +22,11 @@ var (
 func main() {
 	flag.Parse()
 
+	weed_server.LoadConfiguration("security", false)
+	grpcDialOption := security.LoadClientTLS(viper.Sub("grpc"), "client")
+
 	for i := 0; i < *repeat; i++ {
-		assignResult, err := operation.Assign(*master, &operation.VolumeAssignRequest{Count: 1})
+		assignResult, err := operation.Assign(*master, grpcDialOption, &operation.VolumeAssignRequest{Count: 1})
 		if err != nil {
 			log.Fatalf("assign: %v", err)
 		}
@@ -31,12 +37,12 @@ func main() {
 
 		targetUrl := fmt.Sprintf("http://%s/%s", assignResult.Url, assignResult.Fid)
 
-		_, err = operation.Upload(targetUrl, fmt.Sprintf("test%d", i), reader, false, "", nil, "")
+		_, err = operation.Upload(targetUrl, fmt.Sprintf("test%d", i), reader, false, "", nil, assignResult.Auth)
 		if err != nil {
 			log.Fatalf("upload: %v", err)
 		}
 
-		util.Delete(targetUrl, "")
+		util.Delete(targetUrl, string(assignResult.Auth))
 
 		util.Get(fmt.Sprintf("http://%s/vol/vacuum", *master))
 
diff --git a/weed/command/backup.go b/weed/command/backup.go
index 0641f2e5d..86391f9c4 100644
--- a/weed/command/backup.go
+++ b/weed/command/backup.go
@@ -2,6 +2,9 @@ package command
 
 import (
 	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/security"
+	"github.com/chrislusf/seaweedfs/weed/server"
+	"github.com/spf13/viper"
 
 	"github.com/chrislusf/seaweedfs/weed/operation"
 	"github.com/chrislusf/seaweedfs/weed/storage"
@@ -46,6 +49,10 @@ var cmdBackup = &Command{
 }
 
 func runBackup(cmd *Command, args []string) bool {
+
+	weed_server.LoadConfiguration("security", false)
+	grpcDialOption := security.LoadClientTLS(viper.Sub("grpc"), "client")
+
 	if *s.volumeId == -1 {
 		return false
 	}
@@ -59,7 +66,7 @@ func runBackup(cmd *Command, args []string) bool {
 	}
 	volumeServer := lookup.Locations[0].Url
 
-	stats, err := operation.GetVolumeSyncStatus(volumeServer, uint32(vid))
+	stats, err := operation.GetVolumeSyncStatus(volumeServer, grpcDialOption, uint32(vid))
 	if err != nil {
 		fmt.Printf("Error get volume %d status: %v\n", vid, err)
 		return true
@@ -81,7 +88,7 @@ func runBackup(cmd *Command, args []string) bool {
 		return true
 	}
 
-	if err := v.Synchronize(volumeServer); err != nil {
+	if err := v.Synchronize(volumeServer, grpcDialOption); err != nil {
 		fmt.Printf("Error synchronizing volume %d: %v\n", vid, err)
 		return true
 	}
diff --git a/weed/command/benchmark.go b/weed/command/benchmark.go
index 60fd88ccd..44601e567 100644
--- a/weed/command/benchmark.go
+++ b/weed/command/benchmark.go
@@ -4,6 +4,9 @@ import (
 	"bufio"
 	"context"
 	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/server"
+	"github.com/spf13/viper"
+	"google.golang.org/grpc"
 	"io"
 	"math"
 	"math/rand"
@@ -35,13 +38,14 @@ type BenchmarkOptions struct {
 	collection       *string
 	cpuprofile       *string
 	maxCpu           *int
-	secretKey        *string
+	grpcDialOption   grpc.DialOption
 }
 
 var (
 	b            BenchmarkOptions
 	sharedBytes  []byte
 	masterClient *wdclient.MasterClient
+	isSecure     bool
 )
 
 func init() {
@@ -59,7 +63,6 @@ func init() {
 	b.collection = cmdBenchmark.Flag.String("collection", "benchmark", "write data to this collection")
 	b.cpuprofile = cmdBenchmark.Flag.String("cpuprofile", "", "cpu profile output file")
 	b.maxCpu = cmdBenchmark.Flag.Int("maxCpu", 0, "maximum number of CPUs. 0 means all available CPUs")
-	b.secretKey = cmdBenchmark.Flag.String("secure.secret", "", "secret to encrypt Json Web Token(JWT)")
 	sharedBytes = make([]byte, 1024)
 }
 
@@ -102,6 +105,10 @@ var (
 )
 
 func runBenchmark(cmd *Command, args []string) bool {
+
+	weed_server.LoadConfiguration("security", false)
+	b.grpcDialOption = security.LoadClientTLS(viper.Sub("grpc"), "client")
+
 	fmt.Printf("This is SeaweedFS version %s %s %s\n", util.VERSION, runtime.GOOS, runtime.GOARCH)
 	if *b.maxCpu < 1 {
 		*b.maxCpu = runtime.NumCPU()
@@ -116,7 +123,7 @@ func runBenchmark(cmd *Command, args []string) bool {
 		defer pprof.StopCPUProfile()
 	}
 
-	masterClient = wdclient.NewMasterClient(context.Background(), "benchmark", strings.Split(*b.masters, ","))
+	masterClient = wdclient.NewMasterClient(context.Background(), b.grpcDialOption, "client", strings.Split(*b.masters, ","))
 	go masterClient.KeepConnectedToMaster()
 	masterClient.WaitUntilConnected()
 
@@ -188,7 +195,6 @@ func writeFiles(idChan chan int, fileIdLineChan chan string, s *stat) {
 	defer wait.Done()
 	delayedDeleteChan := make(chan *delayedFile, 100)
 	var waitForDeletions sync.WaitGroup
-	secret := security.Secret(*b.secretKey)
 
 	for i := 0; i < 7; i++ {
 		waitForDeletions.Add(1)
@@ -198,8 +204,11 @@ func writeFiles(idChan chan int, fileIdLineChan chan string, s *stat) {
 				if df.enterTime.After(time.Now()) {
 					time.Sleep(df.enterTime.Sub(time.Now()))
 				}
-				if e := util.Delete("http://"+df.fp.Server+"/"+df.fp.Fid,
-					security.GenJwt(secret, df.fp.Fid)); e == nil {
+				var jwtAuthorization security.EncodedJwt
+				if isSecure {
+					jwtAuthorization = operation.LookupJwt(masterClient.GetMaster(), df.fp.Fid)
+				}
+				if e := util.Delete(fmt.Sprintf("http://%s/%s", df.fp.Server, df.fp.Fid), string(jwtAuthorization)); e == nil {
 					s.completed++
 				} else {
 					s.failed++
@@ -222,9 +231,12 @@ func writeFiles(idChan chan int, fileIdLineChan chan string, s *stat) {
 			Count:      1,
 			Collection: *b.collection,
 		}
-		if assignResult, err := operation.Assign(masterClient.GetMaster(), ar); err == nil {
+		if assignResult, err := operation.Assign(masterClient.GetMaster(), b.grpcDialOption, ar); err == nil {
 			fp.Server, fp.Fid, fp.Collection = assignResult.Url, assignResult.Fid, *b.collection
-			if _, err := fp.Upload(0, masterClient.GetMaster(), secret); err == nil {
+			if !isSecure && assignResult.Auth != "" {
+				isSecure = true
+			}
+			if _, err := fp.Upload(0, masterClient.GetMaster(), assignResult.Auth, b.grpcDialOption); err == nil {
 				if random.Intn(100) < *b.deletePercentage {
 					s.total++
 					delayedDeleteChan <- &delayedFile{time.Now().Add(time.Second), fp}
diff --git a/weed/command/filer.go b/weed/command/filer.go
index 0c1950f96..478b7d6bf 100644
--- a/weed/command/filer.go
+++ b/weed/command/filer.go
@@ -1,6 +1,8 @@
 package command
 
 import (
+	"github.com/chrislusf/seaweedfs/weed/security"
+	"github.com/spf13/viper"
 	"net/http"
 	"strconv"
 	"strings"
@@ -28,7 +30,6 @@ type FilerOptions struct {
 	redirectOnRead          *bool
 	disableDirListing       *bool
 	maxMB                   *int
-	secretKey               *string
 	dirListingLimit         *int
 	dataCenter              *string
 	enableNotification      *bool
@@ -49,7 +50,6 @@ func init() {
 	f.redirectOnRead = cmdFiler.Flag.Bool("redirectOnRead", false, "whether proxy or redirect to volume server during file GET request")
 	f.disableDirListing = cmdFiler.Flag.Bool("disableDirListing", false, "turn off directory listing")
 	f.maxMB = cmdFiler.Flag.Int("maxMB", 32, "split files larger than the limit")
-	f.secretKey = cmdFiler.Flag.String("secure.secret", "", "secret to encrypt Json Web Token(JWT)")
 	f.dirListingLimit = cmdFiler.Flag.Int("dirListLimit", 100000, "limit sub dir listing size")
 	f.dataCenter = cmdFiler.Flag.String("dataCenter", "", "prefer to write to volumes in this data center")
 }
@@ -70,13 +70,15 @@ var cmdFiler = &Command{
 
 	The configuration file "filer.toml" is read from ".", "$HOME/.seaweedfs/", or "/etc/seaweedfs/", in that order.
 
-	The example filer.toml configuration file can be generated by "weed scaffold filer"
+	The example filer.toml configuration file can be generated by "weed scaffold -config=filer"
 
 `,
 }
 
 func runFiler(cmd *Command, args []string) bool {
 
+	weed_server.LoadConfiguration("security", false)
+
 	f.startFiler()
 
 	return true
@@ -103,7 +105,6 @@ func (fo *FilerOptions) startFiler() {
 		RedirectOnRead:     *fo.redirectOnRead,
 		DisableDirListing:  *fo.disableDirListing,
 		MaxMB:              *fo.maxMB,
-		SecretKey:          *fo.secretKey,
 		DirListingLimit:    *fo.dirListingLimit,
 		DataCenter:         *fo.dataCenter,
 		DefaultLevelDbDir:  defaultLevelDbDirectory,
@@ -144,7 +145,7 @@ func (fo *FilerOptions) startFiler() {
 	if err != nil {
 		glog.Fatalf("failed to listen on grpc port %d: %v", grpcPort, err)
 	}
-	grpcS := util.NewGrpcServer()
+	grpcS := util.NewGrpcServer(security.LoadServerTLS(viper.Sub("grpc"), "filer"))
 	filer_pb.RegisterSeaweedFilerServer(grpcS, fs)
 	reflection.Register(grpcS)
 	go grpcS.Serve(grpcL)
diff --git a/weed/command/filer_copy.go b/weed/command/filer_copy.go
index 3638bcb27..650757442 100644
--- a/weed/command/filer_copy.go
+++ b/weed/command/filer_copy.go
@@ -2,6 +2,10 @@ package command
 
 import (
 	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/security"
+	"github.com/chrislusf/seaweedfs/weed/server"
+	"github.com/spf13/viper"
+	"google.golang.org/grpc"
 	"io/ioutil"
 	"net/url"
 	"os"
@@ -11,7 +15,6 @@ import (
 	"context"
 	"github.com/chrislusf/seaweedfs/weed/operation"
 	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
-	"github.com/chrislusf/seaweedfs/weed/security"
 	"github.com/chrislusf/seaweedfs/weed/util"
 	"io"
 	"net/http"
@@ -24,16 +27,14 @@ var (
 )
 
 type CopyOptions struct {
-	filerGrpcPort *int
-	master        *string
-	include       *string
-	replication   *string
-	collection    *string
-	ttl           *string
-	maxMB         *int
-	secretKey     *string
-
-	secret security.Secret
+	filerGrpcPort  *int
+	master         *string
+	include        *string
+	replication    *string
+	collection     *string
+	ttl            *string
+	maxMB          *int
+	grpcDialOption grpc.DialOption
 }
 
 func init() {
@@ -46,7 +47,6 @@ func init() {
 	copy.ttl = cmdCopy.Flag.String("ttl", "", "time to live, e.g.: 1m, 1h, 1d, 1M, 1y")
 	copy.maxMB = cmdCopy.Flag.Int("maxMB", 0, "split files larger than the limit")
 	copy.filerGrpcPort = cmdCopy.Flag.Int("filer.port.grpc", 0, "filer grpc server listen port, default to filer port + 10000")
-	copy.secretKey = cmdCopy.Flag.String("secure.secret", "", "secret to encrypt Json Web Token(JWT)")
 }
 
 var cmdCopy = &Command{
@@ -66,7 +66,9 @@ var cmdCopy = &Command{
 }
 
 func runCopy(cmd *Command, args []string) bool {
-	copy.secret = security.Secret(*copy.secretKey)
+
+	weed_server.LoadConfiguration("security", false)
+
 	if len(args) <= 1 {
 		return false
 	}
@@ -101,16 +103,17 @@ func runCopy(cmd *Command, args []string) bool {
 	}
 
 	filerGrpcAddress := fmt.Sprintf("%s:%d", filerUrl.Hostname(), filerGrpcPort)
+	copy.grpcDialOption = security.LoadClientTLS(viper.Sub("grpc"), "client")
 
 	for _, fileOrDir := range fileOrDirs {
-		if !doEachCopy(fileOrDir, filerUrl.Host, filerGrpcAddress, urlPath) {
+		if !doEachCopy(fileOrDir, filerUrl.Host, filerGrpcAddress, copy.grpcDialOption, urlPath) {
 			return false
 		}
 	}
 	return true
 }
 
-func doEachCopy(fileOrDir string, filerAddress, filerGrpcAddress string, path string) bool {
+func doEachCopy(fileOrDir string, filerAddress, filerGrpcAddress string, grpcDialOption grpc.DialOption, path string) bool {
 	f, err := os.Open(fileOrDir)
 	if err != nil {
 		fmt.Printf("Failed to open file %s: %v\n", fileOrDir, err)
@@ -128,7 +131,7 @@ func doEachCopy(fileOrDir string, filerAddress, filerGrpcAddress string, path st
 	if mode.IsDir() {
 		files, _ := ioutil.ReadDir(fileOrDir)
 		for _, subFileOrDir := range files {
-			if !doEachCopy(fileOrDir+"/"+subFileOrDir.Name(), filerAddress, filerGrpcAddress, path+fi.Name()+"/") {
+			if !doEachCopy(fileOrDir+"/"+subFileOrDir.Name(), filerAddress, filerGrpcAddress, grpcDialOption, path+fi.Name()+"/") {
 				return false
 			}
 		}
@@ -150,13 +153,13 @@ func doEachCopy(fileOrDir string, filerAddress, filerGrpcAddress string, path st
 	}
 
 	if chunkCount == 1 {
-		return uploadFileAsOne(filerAddress, filerGrpcAddress, path, f, fi)
+		return uploadFileAsOne(filerAddress, filerGrpcAddress, grpcDialOption, path, f, fi)
 	}
 
-	return uploadFileInChunks(filerAddress, filerGrpcAddress, path, f, fi, chunkCount, chunkSize)
+	return uploadFileInChunks(filerAddress, filerGrpcAddress, grpcDialOption, path, f, fi, chunkCount, chunkSize)
 }
 
-func uploadFileAsOne(filerAddress, filerGrpcAddress string, urlFolder string, f *os.File, fi os.FileInfo) bool {
+func uploadFileAsOne(filerAddress, filerGrpcAddress string, grpcDialOption grpc.DialOption, urlFolder string, f *os.File, fi os.FileInfo) bool {
 
 	// upload the file content
 	fileName := filepath.Base(f.Name())
@@ -167,7 +170,7 @@ func uploadFileAsOne(filerAddress, filerGrpcAddress string, urlFolder string, f
 	if fi.Size() > 0 {
 
 		// assign a volume
-		assignResult, err := operation.Assign(*copy.master, &operation.VolumeAssignRequest{
+		assignResult, err := operation.Assign(*copy.master, grpcDialOption, &operation.VolumeAssignRequest{
 			Count:       1,
 			Replication: *copy.replication,
 			Collection:  *copy.collection,
@@ -179,7 +182,7 @@ func uploadFileAsOne(filerAddress, filerGrpcAddress string, urlFolder string, f
 
 		targetUrl := "http://" + assignResult.Url + "/" + assignResult.Fid
 
-		uploadResult, err := operation.Upload(targetUrl, fileName, f, false, mimeType, nil, "")
+		uploadResult, err := operation.Upload(targetUrl, fileName, f, false, mimeType, nil, assignResult.Auth)
 		if err != nil {
 			fmt.Printf("upload data %v to %s: %v\n", fileName, targetUrl, err)
 			return false
@@ -201,7 +204,7 @@ func uploadFileAsOne(filerAddress, filerGrpcAddress string, urlFolder string, f
 		fmt.Printf("copied %s => http://%s%s%s\n", fileName, filerAddress, urlFolder, fileName)
 	}
 
-	if err := withFilerClient(filerGrpcAddress, func(client filer_pb.SeaweedFilerClient) error {
+	if err := withFilerClient(filerGrpcAddress, grpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
 		request := &filer_pb.CreateEntryRequest{
 			Directory: urlFolder,
 			Entry: &filer_pb.Entry{
@@ -234,7 +237,7 @@ func uploadFileAsOne(filerAddress, filerGrpcAddress string, urlFolder string, f
 	return true
 }
 
-func uploadFileInChunks(filerAddress, filerGrpcAddress string, urlFolder string, f *os.File, fi os.FileInfo, chunkCount int, chunkSize int64) bool {
+func uploadFileInChunks(filerAddress, filerGrpcAddress string, grpcDialOption grpc.DialOption, urlFolder string, f *os.File, fi os.FileInfo, chunkCount int, chunkSize int64) bool {
 
 	fileName := filepath.Base(f.Name())
 	mimeType := detectMimeType(f)
@@ -244,7 +247,7 @@ func uploadFileInChunks(filerAddress, filerGrpcAddress string, urlFolder string,
 	for i := int64(0); i < int64(chunkCount); i++ {
 
 		// assign a volume
-		assignResult, err := operation.Assign(*copy.master, &operation.VolumeAssignRequest{
+		assignResult, err := operation.Assign(*copy.master, grpcDialOption, &operation.VolumeAssignRequest{
 			Count:       1,
 			Replication: *copy.replication,
 			Collection:  *copy.collection,
@@ -259,7 +262,7 @@ func uploadFileInChunks(filerAddress, filerGrpcAddress string, urlFolder string,
 		uploadResult, err := operation.Upload(targetUrl,
 			fileName+"-"+strconv.FormatInt(i+1, 10),
 			io.LimitReader(f, chunkSize),
-			false, "application/octet-stream", nil, "")
+			false, "application/octet-stream", nil, assignResult.Auth)
 		if err != nil {
 			fmt.Printf("upload data %v to %s: %v\n", fileName, targetUrl, err)
 			return false
@@ -278,7 +281,7 @@ func uploadFileInChunks(filerAddress, filerGrpcAddress string, urlFolder string,
 		fmt.Printf("uploaded %s-%d to %s [%d,%d)\n", fileName, i+1, targetUrl, i*chunkSize, i*chunkSize+int64(uploadResult.Size))
 	}
 
-	if err := withFilerClient(filerGrpcAddress, func(client filer_pb.SeaweedFilerClient) error {
+	if err := withFilerClient(filerGrpcAddress, grpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
 		request := &filer_pb.CreateEntryRequest{
 			Directory: urlFolder,
 			Entry: &filer_pb.Entry{
@@ -329,9 +332,9 @@ func detectMimeType(f *os.File) string {
 	return mimeType
 }
 
-func withFilerClient(filerAddress string, fn func(filer_pb.SeaweedFilerClient) error) error {
+func withFilerClient(filerAddress string, grpcDialOption grpc.DialOption, fn func(filer_pb.SeaweedFilerClient) error) error {
 
-	grpcConnection, err := util.GrpcDial(filerAddress)
+	grpcConnection, err := util.GrpcDial(filerAddress, grpcDialOption)
 	if err != nil {
 		return fmt.Errorf("fail to dial %s: %v", filerAddress, err)
 	}
diff --git a/weed/command/filer_replication.go b/weed/command/filer_replication.go
index 3384e4023..c9afbdc8a 100644
--- a/weed/command/filer_replication.go
+++ b/weed/command/filer_replication.go
@@ -28,13 +28,14 @@ var cmdFilerReplicate = &Command{
 	filer.replicate listens on filer notifications. If any file is updated, it will fetch the updated content,
 	and write to the other destination.
 
-	Run "weed scaffold -config replication" to generate a replication.toml file and customize the parameters.
+	Run "weed scaffold -config=replication" to generate a replication.toml file and customize the parameters.
 
   `,
 }
 
 func runFilerReplicate(cmd *Command, args []string) bool {
 
+	weed_server.LoadConfiguration("security", false)
 	weed_server.LoadConfiguration("replication", true)
 	weed_server.LoadConfiguration("notification", true)
 	config := viper.GetViper()
diff --git a/weed/command/master.go b/weed/command/master.go
index bd2267b9e..5b45c9627 100644
--- a/weed/command/master.go
+++ b/weed/command/master.go
@@ -1,6 +1,8 @@
 package command
 
 import (
+	"github.com/chrislusf/seaweedfs/weed/security"
+	"github.com/spf13/viper"
 	"net/http"
 	"os"
 	"runtime"
@@ -23,8 +25,11 @@ func init() {
 var cmdMaster = &Command{
 	UsageLine: "master -port=9333",
 	Short:     "start a master server",
-	Long: `start a master server to provide volume=>location mapping service
-  and sequence number of file ids
+	Long: `start a master server to provide volume=>location mapping service and sequence number of file ids
+
+	The configuration file "security.toml" is read from ".", "$HOME/.seaweedfs/", or "/etc/seaweedfs/", in that order.
+
+	The example security.toml configuration file can be generated by "weed scaffold -config=security"
 
   `,
 }
@@ -44,7 +49,6 @@ var (
 	mMaxCpu               = cmdMaster.Flag.Int("maxCpu", 0, "maximum number of CPUs. 0 means all available CPUs")
 	garbageThreshold      = cmdMaster.Flag.Float64("garbageThreshold", 0.3, "threshold to vacuum and reclaim spaces")
 	masterWhiteListOption = cmdMaster.Flag.String("whiteList", "", "comma separated Ip addresses having write permission. No limit if empty.")
-	masterSecureKey       = cmdMaster.Flag.String("secure.secret", "", "secret to encrypt Json Web Token(JWT)")
 	masterCpuProfile      = cmdMaster.Flag.String("cpuprofile", "", "cpu profile output file")
 	masterMemProfile      = cmdMaster.Flag.String("memprofile", "", "memory profile output file")
 
@@ -52,6 +56,9 @@ var (
 )
 
 func runMaster(cmd *Command, args []string) bool {
+
+	weed_server.LoadConfiguration("security", false)
+
 	if *mMaxCpu < 1 {
 		*mMaxCpu = runtime.NumCPU()
 	}
@@ -72,7 +79,7 @@ func runMaster(cmd *Command, args []string) bool {
 	ms := weed_server.NewMasterServer(r, *mport, *metaFolder,
 		*volumeSizeLimitMB, *volumePreallocate,
 		*mpulse, *defaultReplicaPlacement, *garbageThreshold,
-		masterWhiteList, *masterSecureKey,
+		masterWhiteList,
 	)
 
 	listeningAddress := *masterBindIp + ":" + strconv.Itoa(*mport)
@@ -102,7 +109,7 @@ func runMaster(cmd *Command, args []string) bool {
 			glog.Fatalf("master failed to listen on grpc port %d: %v", grpcPort, err)
 		}
 		// Create your protocol servers.
-		grpcS := util.NewGrpcServer()
+		grpcS := util.NewGrpcServer(security.LoadServerTLS(viper.Sub("grpc"), "master"))
 		master_pb.RegisterSeaweedServer(grpcS, ms)
 		reflection.Register(grpcS)
 
diff --git a/weed/command/mount_std.go b/weed/command/mount_std.go
index 2937b9ef1..3e4249bfc 100644
--- a/weed/command/mount_std.go
+++ b/weed/command/mount_std.go
@@ -4,6 +4,9 @@ package command
 
 import (
 	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/security"
+	"github.com/chrislusf/seaweedfs/weed/server"
+	"github.com/spf13/viper"
 	"os"
 	"os/user"
 	"runtime"
@@ -19,6 +22,9 @@ import (
 )
 
 func runMount(cmd *Command, args []string) bool {
+
+	weed_server.LoadConfiguration("security", false)
+
 	fmt.Printf("This is SeaweedFS version %s %s %s\n", util.VERSION, runtime.GOOS, runtime.GOARCH)
 	if *mountOptions.dir == "" {
 		fmt.Printf("Please specify the mount directory via \"-dir\"")
@@ -91,6 +97,7 @@ func runMount(cmd *Command, args []string) bool {
 
 	err = fs.Serve(c, filesys.NewSeaweedFileSystem(&filesys.Option{
 		FilerGrpcAddress:   filerGrpcAddress,
+		GrpcDialOption:     security.LoadClientTLS(viper.Sub("grpc"), "client"),
 		FilerMountRootPath: mountRoot,
 		Collection:         *mountOptions.collection,
 		Replication:        *mountOptions.replication,
diff --git a/weed/command/s3.go b/weed/command/s3.go
index 16a9490ff..a54ddd2f7 100644
--- a/weed/command/s3.go
+++ b/weed/command/s3.go
@@ -1,6 +1,9 @@
 package command
 
 import (
+	"github.com/chrislusf/seaweedfs/weed/security"
+	"github.com/chrislusf/seaweedfs/weed/server"
+	"github.com/spf13/viper"
 	"net/http"
 	"time"
 
@@ -46,6 +49,8 @@ var cmdS3 = &Command{
 
 func runS3(cmd *Command, args []string) bool {
 
+	weed_server.LoadConfiguration("security", false)
+
 	filerGrpcAddress, err := parseFilerGrpcAddress(*s3options.filer, *s3options.filerGrpcPort)
 	if err != nil {
 		glog.Fatal(err)
@@ -59,6 +64,7 @@ func runS3(cmd *Command, args []string) bool {
 		FilerGrpcAddress: filerGrpcAddress,
 		DomainName:       *s3options.domainName,
 		BucketsPath:      *s3options.filerBucketsPath,
+		GrpcDialOption:   security.LoadClientTLS(viper.Sub("grpc"), "client"),
 	})
 	if s3ApiServer_err != nil {
 		glog.Fatalf("S3 API Server startup error: %v", s3ApiServer_err)
diff --git a/weed/command/scaffold.go b/weed/command/scaffold.go
index ec0723859..e8608e9dd 100644
--- a/weed/command/scaffold.go
+++ b/weed/command/scaffold.go
@@ -10,7 +10,7 @@ func init() {
 }
 
 var cmdScaffold = &Command{
-	UsageLine: "scaffold [filer]",
+	UsageLine: "scaffold -config=[filer|notification|replication|security]",
 	Short:     "generate basic configuration files",
 	Long: `Generate filer.toml with all possible configurations for you to customize.
 
@@ -19,7 +19,7 @@ var cmdScaffold = &Command{
 
 var (
 	outputPath = cmdScaffold.Flag.String("output", "", "if not empty, save the configuration file to this directory")
-	config     = cmdScaffold.Flag.String("config", "filer", "[filer|notification|replication] the configuration file to generate")
+	config     = cmdScaffold.Flag.String("config", "filer", "[filer|notification|replication|security] the configuration file to generate")
 )
 
 func runScaffold(cmd *Command, args []string) bool {
@@ -32,6 +32,8 @@ func runScaffold(cmd *Command, args []string) bool {
 		content = NOTIFICATION_TOML_EXAMPLE
 	case "replication":
 		content = REPLICATION_TOML_EXAMPLE
+	case "security":
+		content = SECURITY_TOML_EXAMPLE
 	}
 	if content == "" {
 		println("need a valid -config option")
@@ -239,5 +241,43 @@ b2_master_application_key  = ""
 bucket = "mybucket"            # an existing bucket
 directory = "/"                # destination directory
 
+`
+
+	SECURITY_TOML_EXAMPLE = `
+# Put this file to one of the location, with descending priority
+#    ./security.toml
+#    $HOME/.seaweedfs/security.toml
+#    /etc/seaweedfs/security.toml
+# this file is read by master, volume server, and filer
+
+# the jwt signing key is read by master and volume server
+# a jwt expires in 10 seconds
+[jwt.signing]
+key = ""
+
+# volume server also uses grpc that should be secured.
+
+# all grpc tls authentications are mutual 
+[grpc]
+ca = ""
+
+[grpc.volume]
+cert = ""
+key = ""
+
+[grpc.master]
+cert = ""
+key = ""
+
+[grpc.filer]
+cert = ""
+key = ""
+
+# use this for any place needs a grpc client
+# i.e., "weed backup|benchmark|filer.copy|filer.replicate|mount|s3|upload"
+[grpc.client]
+cert = ""
+key = ""
+
 `
 )
diff --git a/weed/command/server.go b/weed/command/server.go
index ba5305a97..a9415d068 100644
--- a/weed/command/server.go
+++ b/weed/command/server.go
@@ -1,6 +1,8 @@
 package command
 
 import (
+	"github.com/chrislusf/seaweedfs/weed/security"
+	"github.com/spf13/viper"
 	"net/http"
 	"os"
 	"runtime"
@@ -58,7 +60,6 @@ var (
 	serverRack                    = cmdServer.Flag.String("rack", "", "current volume server's rack name")
 	serverWhiteListOption         = cmdServer.Flag.String("whiteList", "", "comma separated Ip addresses having write permission. No limit if empty.")
 	serverPeers                   = cmdServer.Flag.String("master.peers", "", "all master nodes in comma separated ip:masterPort list")
-	serverSecureKey               = cmdServer.Flag.String("secure.secret", "", "secret to encrypt Json Web Token(JWT)")
 	serverGarbageThreshold        = cmdServer.Flag.Float64("garbageThreshold", 0.3, "threshold to vacuum and reclaim spaces")
 	masterPort                    = cmdServer.Flag.Int("master.port", 9333, "master server http listen port")
 	masterGrpcPort                = cmdServer.Flag.Int("master.port.grpc", 0, "master grpc server listen port, default to http port + 10000")
@@ -96,7 +97,9 @@ func init() {
 }
 
 func runServer(cmd *Command, args []string) bool {
-	filerOptions.secretKey = serverSecureKey
+
+	weed_server.LoadConfiguration("security", false)
+
 	if *serverOptions.cpuprofile != "" {
 		f, err := os.Create(*serverOptions.cpuprofile)
 		if err != nil {
@@ -170,7 +173,7 @@ func runServer(cmd *Command, args []string) bool {
 		ms := weed_server.NewMasterServer(r, *masterPort, *masterMetaFolder,
 			*masterVolumeSizeLimitMB, *masterVolumePreallocate,
 			*pulseSeconds, *masterDefaultReplicaPlacement, *serverGarbageThreshold,
-			serverWhiteList, *serverSecureKey,
+			serverWhiteList,
 		)
 
 		glog.V(0).Infof("Start Seaweed Master %s at %s:%d", util.VERSION, *serverIp, *masterPort)
@@ -190,7 +193,8 @@ func runServer(cmd *Command, args []string) bool {
 				glog.Fatalf("master failed to listen on grpc port %d: %v", grpcPort, err)
 			}
 			// Create your protocol servers.
-			grpcS := util.NewGrpcServer()
+			glog.V(0).Infof("grpc config %+v", viper.Sub("grpc"))
+			grpcS := util.NewGrpcServer(security.LoadServerTLS(viper.Sub("grpc"), "master"))
 			master_pb.RegisterSeaweedServer(grpcS, ms)
 			reflection.Register(grpcS)
 
diff --git a/weed/command/upload.go b/weed/command/upload.go
index 244caaa4c..80fc635c1 100644
--- a/weed/command/upload.go
+++ b/weed/command/upload.go
@@ -3,11 +3,13 @@ package command
 import (
 	"encoding/json"
 	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/security"
+	"github.com/chrislusf/seaweedfs/weed/server"
+	"github.com/spf13/viper"
 	"os"
 	"path/filepath"
 
 	"github.com/chrislusf/seaweedfs/weed/operation"
-	"github.com/chrislusf/seaweedfs/weed/security"
 )
 
 var (
@@ -23,7 +25,6 @@ type UploadOptions struct {
 	dataCenter  *string
 	ttl         *string
 	maxMB       *int
-	secretKey   *string
 }
 
 func init() {
@@ -37,7 +38,6 @@ func init() {
 	upload.dataCenter = cmdUpload.Flag.String("dataCenter", "", "optional data center name")
 	upload.ttl = cmdUpload.Flag.String("ttl", "", "time to live, e.g.: 1m, 1h, 1d, 1M, 1y")
 	upload.maxMB = cmdUpload.Flag.Int("maxMB", 0, "split files larger than the limit")
-	upload.secretKey = cmdUpload.Flag.String("secure.secret", "", "secret to encrypt Json Web Token(JWT)")
 }
 
 var cmdUpload = &Command{
@@ -60,7 +60,10 @@ var cmdUpload = &Command{
 }
 
 func runUpload(cmd *Command, args []string) bool {
-	secret := security.Secret(*upload.secretKey)
+
+	weed_server.LoadConfiguration("security", false)
+	grpcDialOption := security.LoadClientTLS(viper.Sub("grpc"), "client")
+
 	if len(args) == 0 {
 		if *upload.dir == "" {
 			return false
@@ -77,9 +80,9 @@ func runUpload(cmd *Command, args []string) bool {
 					if e != nil {
 						return e
 					}
-					results, e := operation.SubmitFiles(*upload.master, parts,
+					results, e := operation.SubmitFiles(*upload.master, grpcDialOption, parts,
 						*upload.replication, *upload.collection, *upload.dataCenter,
-						*upload.ttl, *upload.maxMB, secret)
+						*upload.ttl, *upload.maxMB)
 					bytes, _ := json.Marshal(results)
 					fmt.Println(string(bytes))
 					if e != nil {
@@ -96,9 +99,9 @@ func runUpload(cmd *Command, args []string) bool {
 		if e != nil {
 			fmt.Println(e.Error())
 		}
-		results, _ := operation.SubmitFiles(*upload.master, parts,
+		results, _ := operation.SubmitFiles(*upload.master, grpcDialOption, parts,
 			*upload.replication, *upload.collection, *upload.dataCenter,
-			*upload.ttl, *upload.maxMB, secret)
+			*upload.ttl, *upload.maxMB)
 		bytes, _ := json.Marshal(results)
 		fmt.Println(string(bytes))
 	}
diff --git a/weed/command/volume.go b/weed/command/volume.go
index 27a075b5b..32ec7819b 100644
--- a/weed/command/volume.go
+++ b/weed/command/volume.go
@@ -1,6 +1,8 @@
 package command
 
 import (
+	"github.com/chrislusf/seaweedfs/weed/security"
+	"github.com/spf13/viper"
 	"net/http"
 	"os"
 	"runtime"
@@ -78,6 +80,9 @@ var (
 )
 
 func runVolume(cmd *Command, args []string) bool {
+
+	weed_server.LoadConfiguration("security", false)
+
 	if *v.maxCpu < 1 {
 		*v.maxCpu = runtime.NumCPU()
 	}
@@ -185,7 +190,7 @@ func (v VolumeServerOptions) startVolumeServer(volumeFolders, maxVolumeCounts, v
 	if err != nil {
 		glog.Fatalf("failed to listen on grpc port %d: %v", grpcPort, err)
 	}
-	grpcS := util.NewGrpcServer()
+	grpcS := util.NewGrpcServer(security.LoadServerTLS(viper.Sub("grpc"), "volume"))
 	volume_server_pb.RegisterVolumeServerServer(grpcS, volumeServer)
 	reflection.Register(grpcS)
 	go grpcS.Serve(grpcL)
diff --git a/weed/filer2/filer.go b/weed/filer2/filer.go
index 1ee2f5ede..672c6201c 100644
--- a/weed/filer2/filer.go
+++ b/weed/filer2/filer.go
@@ -3,6 +3,7 @@ package filer2
 import (
 	"context"
 	"fmt"
+	"google.golang.org/grpc"
 	"math"
 	"os"
 	"path/filepath"
@@ -24,13 +25,15 @@ type Filer struct {
 	directoryCache     *ccache.Cache
 	MasterClient       *wdclient.MasterClient
 	fileIdDeletionChan chan string
+	GrpcDialOption     grpc.DialOption
 }
 
-func NewFiler(masters []string) *Filer {
+func NewFiler(masters []string, grpcDialOption grpc.DialOption) *Filer {
 	f := &Filer{
 		directoryCache:     ccache.New(ccache.Configure().MaxSize(1000).ItemsToPrune(100)),
-		MasterClient:       wdclient.NewMasterClient(context.Background(), "filer", masters),
+		MasterClient:       wdclient.NewMasterClient(context.Background(), grpcDialOption, "filer", masters),
 		fileIdDeletionChan: make(chan string, 4096),
+		GrpcDialOption:     grpcDialOption,
 	}
 
 	go f.loopProcessingDeletion()
diff --git a/weed/filer2/filer_deletion.go b/weed/filer2/filer_deletion.go
index 8fe8ae04f..c7d02657d 100644
--- a/weed/filer2/filer_deletion.go
+++ b/weed/filer2/filer_deletion.go
@@ -38,13 +38,13 @@ func (f *Filer) loopProcessingDeletion() {
 			fileIds = append(fileIds, fid)
 			if len(fileIds) >= 4096 {
 				glog.V(1).Infof("deleting fileIds len=%d", len(fileIds))
-				operation.DeleteFilesWithLookupVolumeId(fileIds, lookupFunc)
+				operation.DeleteFilesWithLookupVolumeId(f.GrpcDialOption, fileIds, lookupFunc)
 				fileIds = fileIds[:0]
 			}
 		case <-ticker.C:
 			if len(fileIds) > 0 {
 				glog.V(1).Infof("timed deletion fileIds len=%d", len(fileIds))
-				operation.DeleteFilesWithLookupVolumeId(fileIds, lookupFunc)
+				operation.DeleteFilesWithLookupVolumeId(f.GrpcDialOption, fileIds, lookupFunc)
 				fileIds = fileIds[:0]
 			}
 		}
diff --git a/weed/filer2/leveldb/leveldb_store_test.go b/weed/filer2/leveldb/leveldb_store_test.go
index 5b214558f..4d600e0bf 100644
--- a/weed/filer2/leveldb/leveldb_store_test.go
+++ b/weed/filer2/leveldb/leveldb_store_test.go
@@ -8,7 +8,7 @@ import (
 )
 
 func TestCreateAndFind(t *testing.T) {
-	filer := filer2.NewFiler(nil)
+	filer := filer2.NewFiler(nil, nil)
 	dir, _ := ioutil.TempDir("", "seaweedfs_filer_test")
 	defer os.RemoveAll(dir)
 	store := &LevelDBStore{}
@@ -61,7 +61,7 @@ func TestCreateAndFind(t *testing.T) {
 }
 
 func TestEmptyRoot(t *testing.T) {
-	filer := filer2.NewFiler(nil)
+	filer := filer2.NewFiler(nil, nil)
 	dir, _ := ioutil.TempDir("", "seaweedfs_filer_test2")
 	defer os.RemoveAll(dir)
 	store := &LevelDBStore{}
diff --git a/weed/filer2/memdb/memdb_store_test.go b/weed/filer2/memdb/memdb_store_test.go
index cf813e04b..31da8998f 100644
--- a/weed/filer2/memdb/memdb_store_test.go
+++ b/weed/filer2/memdb/memdb_store_test.go
@@ -6,7 +6,7 @@ import (
 )
 
 func TestCreateAndFind(t *testing.T) {
-	filer := filer2.NewFiler(nil)
+	filer := filer2.NewFiler(nil, nil)
 	store := &MemDbStore{}
 	store.Initialize(nil)
 	filer.SetStore(store)
@@ -43,7 +43,7 @@ func TestCreateAndFind(t *testing.T) {
 }
 
 func TestCreateFileAndList(t *testing.T) {
-	filer := filer2.NewFiler(nil)
+	filer := filer2.NewFiler(nil, nil)
 	store := &MemDbStore{}
 	store.Initialize(nil)
 	filer.SetStore(store)
diff --git a/weed/filesys/dirty_page.go b/weed/filesys/dirty_page.go
index 696296e62..69f652ead 100644
--- a/weed/filesys/dirty_page.go
+++ b/weed/filesys/dirty_page.go
@@ -4,13 +4,14 @@ import (
 	"bytes"
 	"context"
 	"fmt"
+	"sync"
 	"sync/atomic"
 	"time"
 
 	"github.com/chrislusf/seaweedfs/weed/glog"
 	"github.com/chrislusf/seaweedfs/weed/operation"
 	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
-	"sync"
+	"github.com/chrislusf/seaweedfs/weed/security"
 )
 
 type ContinuousDirtyPages struct {
@@ -164,6 +165,7 @@ func (pages *ContinuousDirtyPages) saveExistingPagesToStorage(ctx context.Contex
 func (pages *ContinuousDirtyPages) saveToStorage(ctx context.Context, buf []byte, offset int64) (*filer_pb.FileChunk, error) {
 
 	var fileId, host string
+	var auth security.EncodedJwt
 
 	if err := pages.f.wfs.withFilerClient(func(client filer_pb.SeaweedFilerClient) error {
 
@@ -181,7 +183,7 @@ func (pages *ContinuousDirtyPages) saveToStorage(ctx context.Context, buf []byte
 			return err
 		}
 
-		fileId, host = resp.FileId, resp.Url
+		fileId, host, auth = resp.FileId, resp.Url, security.EncodedJwt(resp.Auth)
 
 		return nil
 	}); err != nil {
@@ -190,7 +192,7 @@ func (pages *ContinuousDirtyPages) saveToStorage(ctx context.Context, buf []byte
 
 	fileUrl := fmt.Sprintf("http://%s/%s", host, fileId)
 	bufReader := bytes.NewReader(buf)
-	uploadResult, err := operation.Upload(fileUrl, pages.f.Name, bufReader, false, "application/octet-stream", nil, "")
+	uploadResult, err := operation.Upload(fileUrl, pages.f.Name, bufReader, false, "application/octet-stream", nil, auth)
 	if err != nil {
 		glog.V(0).Infof("upload data %v to %s: %v", pages.f.Name, fileUrl, err)
 		return nil, fmt.Errorf("upload data: %v", err)
diff --git a/weed/filesys/filehandle.go b/weed/filesys/filehandle.go
index 0f6ca1164..3bca0e22e 100644
--- a/weed/filesys/filehandle.go
+++ b/weed/filesys/filehandle.go
@@ -10,6 +10,7 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/util"
 	"github.com/seaweedfs/fuse"
 	"github.com/seaweedfs/fuse/fs"
+	"google.golang.org/grpc"
 	"net/http"
 	"strings"
 	"sync"
@@ -230,7 +231,7 @@ func (fh *FileHandle) Flush(ctx context.Context, req *fuse.FlushRequest) error {
 	})
 }
 
-func deleteFileIds(ctx context.Context, client filer_pb.SeaweedFilerClient, fileIds []string) error {
+func deleteFileIds(ctx context.Context, grpcDialOption grpc.DialOption, client filer_pb.SeaweedFilerClient, fileIds []string) error {
 
 	var vids []string
 	for _, fileId := range fileIds {
@@ -267,7 +268,7 @@ func deleteFileIds(ctx context.Context, client filer_pb.SeaweedFilerClient, file
 		return m, err
 	}
 
-	_, err := operation.DeleteFilesWithLookupVolumeId(fileIds, lookupFunc)
+	_, err := operation.DeleteFilesWithLookupVolumeId(grpcDialOption, fileIds, lookupFunc)
 
 	return err
 }
diff --git a/weed/filesys/wfs.go b/weed/filesys/wfs.go
index 969514a06..f7383582d 100644
--- a/weed/filesys/wfs.go
+++ b/weed/filesys/wfs.go
@@ -19,6 +19,7 @@ import (
 
 type Option struct {
 	FilerGrpcAddress   string
+	GrpcDialOption     grpc.DialOption
 	FilerMountRootPath string
 	Collection         string
 	Replication        string
@@ -46,8 +47,6 @@ type WFS struct {
 	pathToHandleLock  sync.Mutex
 	bufPool           sync.Pool
 
-	fileIdsDeletionChan chan []string
-
 	stats statsCache
 }
 type statsCache struct {
@@ -65,11 +64,8 @@ func NewSeaweedFileSystem(option *Option) *WFS {
 				return make([]byte, option.ChunkSizeLimit)
 			},
 		},
-		fileIdsDeletionChan: make(chan []string, 32),
 	}
 
-	go wfs.loopProcessingDeletion()
-
 	return wfs
 }
 
@@ -82,7 +78,7 @@ func (wfs *WFS) withFilerClient(fn func(filer_pb.SeaweedFilerClient) error) erro
 	return util.WithCachedGrpcClient(func(grpcConnection *grpc.ClientConn) error {
 		client := filer_pb.NewSeaweedFilerClient(grpcConnection)
 		return fn(client)
-	}, wfs.option.FilerGrpcAddress)
+	}, wfs.option.FilerGrpcAddress, wfs.option.GrpcDialOption)
 
 }
 
diff --git a/weed/filesys/wfs_deletion.go b/weed/filesys/wfs_deletion.go
index f58ef24f4..90058d75a 100644
--- a/weed/filesys/wfs_deletion.go
+++ b/weed/filesys/wfs_deletion.go
@@ -2,39 +2,9 @@ package filesys
 
 import (
 	"context"
-	"time"
-
-	"github.com/chrislusf/seaweedfs/weed/glog"
 	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
 )
 
-func (wfs *WFS) loopProcessingDeletion() {
-
-	ticker := time.NewTicker(2 * time.Second)
-
-	wfs.withFilerClient(func(client filer_pb.SeaweedFilerClient) error {
-		var fileIds []string
-		for {
-			select {
-			case fids := <-wfs.fileIdsDeletionChan:
-				fileIds = append(fileIds, fids...)
-				if len(fileIds) >= 1024 {
-					glog.V(1).Infof("deleting fileIds len=%d", len(fileIds))
-					deleteFileIds(context.Background(), client, fileIds)
-					fileIds = fileIds[:0]
-				}
-			case <-ticker.C:
-				if len(fileIds) > 0 {
-					glog.V(1).Infof("timed deletion fileIds len=%d", len(fileIds))
-					deleteFileIds(context.Background(), client, fileIds)
-					fileIds = fileIds[:0]
-				}
-			}
-		}
-	})
-
-}
-
 func (wfs *WFS) deleteFileChunks(chunks []*filer_pb.FileChunk) {
 	if len(chunks) == 0 {
 		return
@@ -45,14 +15,8 @@ func (wfs *WFS) deleteFileChunks(chunks []*filer_pb.FileChunk) {
 		fileIds = append(fileIds, chunk.FileId)
 	}
 
-	var async = false
-	if async {
-		wfs.fileIdsDeletionChan <- fileIds
-		return
-	}
-
 	wfs.withFilerClient(func(client filer_pb.SeaweedFilerClient) error {
-		deleteFileIds(context.Background(), client, fileIds)
+		deleteFileIds(context.Background(), wfs.option.GrpcDialOption, client, fileIds)
 		return nil
 	})
 }
diff --git a/weed/operation/assign_file_id.go b/weed/operation/assign_file_id.go
index 00e1caad5..7e7a9059d 100644
--- a/weed/operation/assign_file_id.go
+++ b/weed/operation/assign_file_id.go
@@ -3,9 +3,13 @@ package operation
 import (
 	"context"
 	"fmt"
+	"google.golang.org/grpc"
+	"strings"
 	"time"
 
 	"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
+	"github.com/chrislusf/seaweedfs/weed/security"
+	"github.com/chrislusf/seaweedfs/weed/util"
 )
 
 type VolumeAssignRequest struct {
@@ -19,14 +23,15 @@ type VolumeAssignRequest struct {
 }
 
 type AssignResult struct {
-	Fid       string `json:"fid,omitempty"`
-	Url       string `json:"url,omitempty"`
-	PublicUrl string `json:"publicUrl,omitempty"`
-	Count     uint64 `json:"count,omitempty"`
-	Error     string `json:"error,omitempty"`
+	Fid       string              `json:"fid,omitempty"`
+	Url       string              `json:"url,omitempty"`
+	PublicUrl string              `json:"publicUrl,omitempty"`
+	Count     uint64              `json:"count,omitempty"`
+	Error     string              `json:"error,omitempty"`
+	Auth      security.EncodedJwt `json:"auth,omitempty"`
 }
 
-func Assign(server string, primaryRequest *VolumeAssignRequest, alternativeRequests ...*VolumeAssignRequest) (*AssignResult, error) {
+func Assign(server string, grpcDialOption grpc.DialOption, primaryRequest *VolumeAssignRequest, alternativeRequests ...*VolumeAssignRequest) (*AssignResult, error) {
 
 	var requests []*VolumeAssignRequest
 	requests = append(requests, primaryRequest)
@@ -40,7 +45,7 @@ func Assign(server string, primaryRequest *VolumeAssignRequest, alternativeReque
 			continue
 		}
 
-		lastError = withMasterServerClient(server, func(masterClient master_pb.SeaweedClient) error {
+		lastError = withMasterServerClient(server, grpcDialOption, func(masterClient master_pb.SeaweedClient) error {
 			ctx, cancel := context.WithTimeout(context.Background(), time.Duration(5*time.Second))
 			defer cancel()
 
@@ -63,6 +68,7 @@ func Assign(server string, primaryRequest *VolumeAssignRequest, alternativeReque
 			ret.Url = resp.Url
 			ret.PublicUrl = resp.PublicUrl
 			ret.Error = resp.Error
+			ret.Auth = security.EncodedJwt(resp.Auth)
 
 			return nil
 
@@ -81,3 +87,17 @@ func Assign(server string, primaryRequest *VolumeAssignRequest, alternativeReque
 
 	return ret, lastError
 }
+
+func LookupJwt(master string, fileId string) security.EncodedJwt {
+
+	tokenStr := ""
+
+	if h, e := util.Head(fmt.Sprintf("http://%s/dir/lookup?fileId=%s", master, fileId)); e == nil {
+		bearer := h.Get("Authorization")
+		if len(bearer) > 7 && strings.ToUpper(bearer[0:6]) == "BEARER" {
+			tokenStr = bearer[7:]
+		}
+	}
+
+	return security.EncodedJwt(tokenStr)
+}
diff --git a/weed/operation/chunked_file.go b/weed/operation/chunked_file.go
index 9d8267dee..f3f6e7b00 100644
--- a/weed/operation/chunked_file.go
+++ b/weed/operation/chunked_file.go
@@ -4,6 +4,7 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
+	"google.golang.org/grpc"
 	"io"
 	"net/http"
 	"sort"
@@ -69,12 +70,12 @@ func (cm *ChunkManifest) Marshal() ([]byte, error) {
 	return json.Marshal(cm)
 }
 
-func (cm *ChunkManifest) DeleteChunks(master string) error {
+func (cm *ChunkManifest) DeleteChunks(master string, grpcDialOption grpc.DialOption) error {
 	var fileIds []string
 	for _, ci := range cm.Chunks {
 		fileIds = append(fileIds, ci.Fid)
 	}
-	results, err := DeleteFiles(master, fileIds)
+	results, err := DeleteFiles(master, grpcDialOption, fileIds)
 	if err != nil {
 		glog.V(0).Infof("delete %+v: %v", fileIds, err)
 		return fmt.Errorf("chunk delete: %v", err)
diff --git a/weed/operation/data_struts.go b/weed/operation/data_struts.go
index bfc53aa50..4980f9913 100644
--- a/weed/operation/data_struts.go
+++ b/weed/operation/data_struts.go
@@ -2,6 +2,5 @@ package operation
 
 type JoinResult struct {
 	VolumeSizeLimit uint64 `json:"VolumeSizeLimit,omitempty"`
-	SecretKey       string `json:"secretKey,omitempty"`
 	Error           string `json:"error,omitempty"`
 }
diff --git a/weed/operation/delete_content.go b/weed/operation/delete_content.go
index 3e468e1a3..1df95211e 100644
--- a/weed/operation/delete_content.go
+++ b/weed/operation/delete_content.go
@@ -4,6 +4,7 @@ import (
 	"context"
 	"errors"
 	"fmt"
+	"google.golang.org/grpc"
 	"net/http"
 	"strings"
 	"sync"
@@ -28,17 +29,17 @@ func ParseFileId(fid string) (vid string, key_cookie string, err error) {
 }
 
 // DeleteFiles batch deletes a list of fileIds
-func DeleteFiles(master string, fileIds []string) ([]*volume_server_pb.DeleteResult, error) {
+func DeleteFiles(master string, grpcDialOption grpc.DialOption, fileIds []string) ([]*volume_server_pb.DeleteResult, error) {
 
 	lookupFunc := func(vids []string) (map[string]LookupResult, error) {
-		return LookupVolumeIds(master, vids)
+		return LookupVolumeIds(master, grpcDialOption, vids)
 	}
 
-	return DeleteFilesWithLookupVolumeId(fileIds, lookupFunc)
+	return DeleteFilesWithLookupVolumeId(grpcDialOption, fileIds, lookupFunc)
 
 }
 
-func DeleteFilesWithLookupVolumeId(fileIds []string, lookupFunc func(vid []string) (map[string]LookupResult, error)) ([]*volume_server_pb.DeleteResult, error) {
+func DeleteFilesWithLookupVolumeId(grpcDialOption grpc.DialOption, fileIds []string, lookupFunc func(vid []string) (map[string]LookupResult, error)) ([]*volume_server_pb.DeleteResult, error) {
 
 	var ret []*volume_server_pb.DeleteResult
 
@@ -48,7 +49,7 @@ func DeleteFilesWithLookupVolumeId(fileIds []string, lookupFunc func(vid []strin
 		vid, _, err := ParseFileId(fileId)
 		if err != nil {
 			ret = append(ret, &volume_server_pb.DeleteResult{
-				FileId: vid,
+				FileId: fileId,
 				Status: http.StatusBadRequest,
 				Error:  err.Error()},
 			)
@@ -92,7 +93,7 @@ func DeleteFilesWithLookupVolumeId(fileIds []string, lookupFunc func(vid []strin
 		go func(server string, fidList []string) {
 			defer wg.Done()
 
-			if deleteResults, deleteErr := DeleteFilesAtOneVolumeServer(server, fidList); deleteErr != nil {
+			if deleteResults, deleteErr := DeleteFilesAtOneVolumeServer(server, grpcDialOption, fidList); deleteErr != nil {
 				err = deleteErr
 			} else {
 				ret = append(ret, deleteResults...)
@@ -106,9 +107,9 @@ func DeleteFilesWithLookupVolumeId(fileIds []string, lookupFunc func(vid []strin
 }
 
 // DeleteFilesAtOneVolumeServer deletes a list of files that is on one volume server via gRpc
-func DeleteFilesAtOneVolumeServer(volumeServer string, fileIds []string) (ret []*volume_server_pb.DeleteResult, err error) {
+func DeleteFilesAtOneVolumeServer(volumeServer string, grpcDialOption grpc.DialOption, fileIds []string) (ret []*volume_server_pb.DeleteResult, err error) {
 
-	err = WithVolumeServerClient(volumeServer, func(volumeServerClient volume_server_pb.VolumeServerClient) error {
+	err = WithVolumeServerClient(volumeServer, grpcDialOption, func(volumeServerClient volume_server_pb.VolumeServerClient) error {
 		ctx, cancel := context.WithTimeout(context.Background(), time.Duration(5*time.Second))
 		defer cancel()
 
diff --git a/weed/operation/grpc_client.go b/weed/operation/grpc_client.go
index d0931a8d3..a02844657 100644
--- a/weed/operation/grpc_client.go
+++ b/weed/operation/grpc_client.go
@@ -18,7 +18,7 @@ var (
 	grpcClientsLock sync.Mutex
 )
 
-func WithVolumeServerClient(volumeServer string, fn func(volume_server_pb.VolumeServerClient) error) error {
+func WithVolumeServerClient(volumeServer string, grpcDialOption grpc.DialOption, fn func(volume_server_pb.VolumeServerClient) error) error {
 
 	grpcAddress, err := toVolumeServerGrpcAddress(volumeServer)
 	if err != nil {
@@ -28,7 +28,7 @@ func WithVolumeServerClient(volumeServer string, fn func(volume_server_pb.Volume
 	return util.WithCachedGrpcClient(func(grpcConnection *grpc.ClientConn) error {
 		client := volume_server_pb.NewVolumeServerClient(grpcConnection)
 		return fn(client)
-	}, grpcAddress)
+	}, grpcAddress, grpcDialOption)
 
 }
 
@@ -42,7 +42,7 @@ func toVolumeServerGrpcAddress(volumeServer string) (grpcAddress string, err err
 	return fmt.Sprintf("%s:%d", volumeServer[0:sepIndex], port+10000), nil
 }
 
-func withMasterServerClient(masterServer string, fn func(masterClient master_pb.SeaweedClient) error) error {
+func withMasterServerClient(masterServer string, grpcDialOption grpc.DialOption, fn func(masterClient master_pb.SeaweedClient) error) error {
 
 	masterGrpcAddress, parseErr := util.ParseServerToGrpcAddress(masterServer, 0)
 	if parseErr != nil {
@@ -52,6 +52,6 @@ func withMasterServerClient(masterServer string, fn func(masterClient master_pb.
 	return util.WithCachedGrpcClient(func(grpcConnection *grpc.ClientConn) error {
 		client := master_pb.NewSeaweedClient(grpcConnection)
 		return fn(client)
-	}, masterGrpcAddress)
+	}, masterGrpcAddress, grpcDialOption)
 
 }
diff --git a/weed/operation/lookup.go b/weed/operation/lookup.go
index 562a11580..c4040f3e7 100644
--- a/weed/operation/lookup.go
+++ b/weed/operation/lookup.go
@@ -5,6 +5,7 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
+	"google.golang.org/grpc"
 	"math/rand"
 	"net/url"
 	"strings"
@@ -78,7 +79,7 @@ func LookupFileId(server string, fileId string) (fullUrl string, err error) {
 }
 
 // LookupVolumeIds find volume locations by cache and actual lookup
-func LookupVolumeIds(server string, vids []string) (map[string]LookupResult, error) {
+func LookupVolumeIds(server string, grpcDialOption grpc.DialOption, vids []string) (map[string]LookupResult, error) {
 	ret := make(map[string]LookupResult)
 	var unknown_vids []string
 
@@ -98,7 +99,7 @@ func LookupVolumeIds(server string, vids []string) (map[string]LookupResult, err
 
 	//only query unknown_vids
 
-	err := withMasterServerClient(server, func(masterClient master_pb.SeaweedClient) error {
+	err := withMasterServerClient(server, grpcDialOption, func(masterClient master_pb.SeaweedClient) error {
 		ctx, cancel := context.WithTimeout(context.Background(), time.Duration(5*time.Second))
 		defer cancel()
 
diff --git a/weed/operation/stats.go b/weed/operation/stats.go
index 364727272..9f7166864 100644
--- a/weed/operation/stats.go
+++ b/weed/operation/stats.go
@@ -2,14 +2,15 @@ package operation
 
 import (
 	"context"
+	"google.golang.org/grpc"
 	"time"
 
 	"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
 )
 
-func Statistics(server string, req *master_pb.StatisticsRequest) (resp *master_pb.StatisticsResponse, err error) {
+func Statistics(server string, grpcDialOption grpc.DialOption, req *master_pb.StatisticsRequest) (resp *master_pb.StatisticsResponse, err error) {
 
-	err = withMasterServerClient(server, func(masterClient master_pb.SeaweedClient) error {
+	err = withMasterServerClient(server, grpcDialOption, func(masterClient master_pb.SeaweedClient) error {
 		ctx, cancel := context.WithTimeout(context.Background(), time.Duration(5*time.Second))
 		defer cancel()
 
diff --git a/weed/operation/submit.go b/weed/operation/submit.go
index 7a1a3085e..bdf59d966 100644
--- a/weed/operation/submit.go
+++ b/weed/operation/submit.go
@@ -2,6 +2,7 @@ package operation
 
 import (
 	"bytes"
+	"google.golang.org/grpc"
 	"io"
 	"mime"
 	"net/url"
@@ -36,10 +37,8 @@ type SubmitResult struct {
 	Error    string `json:"error,omitempty"`
 }
 
-func SubmitFiles(master string, files []FilePart,
-	replication string, collection string, dataCenter string, ttl string, maxMB int,
-	secret security.Secret,
-) ([]SubmitResult, error) {
+func SubmitFiles(master string, grpcDialOption grpc.DialOption, files []FilePart,
+	replication string, collection string, dataCenter string, ttl string, maxMB int) ([]SubmitResult, error) {
 	results := make([]SubmitResult, len(files))
 	for index, file := range files {
 		results[index].FileName = file.FileName
@@ -51,7 +50,7 @@ func SubmitFiles(master string, files []FilePart,
 		DataCenter:  dataCenter,
 		Ttl:         ttl,
 	}
-	ret, err := Assign(master, ar)
+	ret, err := Assign(master, grpcDialOption, ar)
 	if err != nil {
 		for index, _ := range files {
 			results[index].Error = err.Error()
@@ -67,7 +66,7 @@ func SubmitFiles(master string, files []FilePart,
 		file.Replication = replication
 		file.Collection = collection
 		file.DataCenter = dataCenter
-		results[index].Size, err = file.Upload(maxMB, master, secret)
+		results[index].Size, err = file.Upload(maxMB, master, ret.Auth, grpcDialOption)
 		if err != nil {
 			results[index].Error = err.Error()
 		}
@@ -110,8 +109,7 @@ func newFilePart(fullPathFilename string) (ret FilePart, err error) {
 	return ret, nil
 }
 
-func (fi FilePart) Upload(maxMB int, master string, secret security.Secret) (retSize uint32, err error) {
-	jwt := security.GenJwt(secret, fi.Fid)
+func (fi FilePart) Upload(maxMB int, master string, jwt security.EncodedJwt, grpcDialOption grpc.DialOption) (retSize uint32, err error) {
 	fileUrl := "http://" + fi.Server + "/" + fi.Fid
 	if fi.ModTime != 0 {
 		fileUrl += "?ts=" + strconv.Itoa(int(fi.ModTime))
@@ -139,7 +137,7 @@ func (fi FilePart) Upload(maxMB int, master string, secret security.Secret) (ret
 				Collection:  fi.Collection,
 				Ttl:         fi.Ttl,
 			}
-			ret, err = Assign(master, ar)
+			ret, err = Assign(master, grpcDialOption, ar)
 			if err != nil {
 				return
 			}
@@ -152,10 +150,10 @@ func (fi FilePart) Upload(maxMB int, master string, secret security.Secret) (ret
 					Collection:  fi.Collection,
 					Ttl:         fi.Ttl,
 				}
-				ret, err = Assign(master, ar)
+				ret, err = Assign(master, grpcDialOption, ar)
 				if err != nil {
 					// delete all uploaded chunks
-					cm.DeleteChunks(master)
+					cm.DeleteChunks(master, grpcDialOption)
 					return
 				}
 				id = ret.Fid
@@ -170,10 +168,10 @@ func (fi FilePart) Upload(maxMB int, master string, secret security.Secret) (ret
 				baseName+"-"+strconv.FormatInt(i+1, 10),
 				io.LimitReader(fi.Reader, chunkSize),
 				master, fileUrl,
-				jwt)
+				ret.Auth)
 			if e != nil {
 				// delete all uploaded chunks
-				cm.DeleteChunks(master)
+				cm.DeleteChunks(master, grpcDialOption)
 				return 0, e
 			}
 			cm.Chunks = append(cm.Chunks,
@@ -188,7 +186,7 @@ func (fi FilePart) Upload(maxMB int, master string, secret security.Secret) (ret
 		err = upload_chunked_file_manifest(fileUrl, &cm, jwt)
 		if err != nil {
 			// delete all uploaded chunks
-			cm.DeleteChunks(master)
+			cm.DeleteChunks(master, grpcDialOption)
 		}
 	} else {
 		ret, e := Upload(fileUrl, baseName, fi.Reader, false, fi.MimeType, nil, jwt)
diff --git a/weed/operation/sync_volume.go b/weed/operation/sync_volume.go
index e40c7de41..bf81415c9 100644
--- a/weed/operation/sync_volume.go
+++ b/weed/operation/sync_volume.go
@@ -3,6 +3,7 @@ package operation
 import (
 	"context"
 	"fmt"
+	"google.golang.org/grpc"
 	"io"
 	"time"
 
@@ -11,9 +12,9 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/util"
 )
 
-func GetVolumeSyncStatus(server string, vid uint32) (resp *volume_server_pb.VolumeSyncStatusResponse, err error) {
+func GetVolumeSyncStatus(server string, grpcDialOption grpc.DialOption, vid uint32) (resp *volume_server_pb.VolumeSyncStatusResponse, err error) {
 
-	WithVolumeServerClient(server, func(client volume_server_pb.VolumeServerClient) error {
+	WithVolumeServerClient(server, grpcDialOption, func(client volume_server_pb.VolumeServerClient) error {
 		ctx, cancel := context.WithTimeout(context.Background(), time.Duration(5*time.Second))
 		defer cancel()
 
@@ -26,9 +27,9 @@ func GetVolumeSyncStatus(server string, vid uint32) (resp *volume_server_pb.Volu
 	return
 }
 
-func GetVolumeIdxEntries(server string, vid uint32, eachEntryFn func(key NeedleId, offset Offset, size uint32)) error {
+func GetVolumeIdxEntries(server string, grpcDialOption grpc.DialOption, vid uint32, eachEntryFn func(key NeedleId, offset Offset, size uint32)) error {
 
-	return WithVolumeServerClient(server, func(client volume_server_pb.VolumeServerClient) error {
+	return WithVolumeServerClient(server, grpcDialOption, func(client volume_server_pb.VolumeServerClient) error {
 		stream, err := client.VolumeSyncIndex(context.Background(), &volume_server_pb.VolumeSyncIndexRequest{
 			VolumdId: vid,
 		})
diff --git a/weed/operation/upload_content.go b/weed/operation/upload_content.go
index 030bf5889..be7b8e69c 100644
--- a/weed/operation/upload_content.go
+++ b/weed/operation/upload_content.go
@@ -58,9 +58,6 @@ func upload_content(uploadUrl string, fillBufferFunction func(w io.Writer) error
 	if isGzipped {
 		h.Set("Content-Encoding", "gzip")
 	}
-	if jwt != "" {
-		h.Set("Authorization", "BEARER "+string(jwt))
-	}
 
 	file_writer, cp_err := body_writer.CreatePart(h)
 	if cp_err != nil {
@@ -86,6 +83,9 @@ func upload_content(uploadUrl string, fillBufferFunction func(w io.Writer) error
 	for k, v := range pairMap {
 		req.Header.Set(k, v)
 	}
+	if jwt != "" {
+		req.Header.Set("Authorization", "BEARER "+string(jwt))
+	}
 	resp, post_err := client.Do(req)
 	if post_err != nil {
 		glog.V(0).Infoln("failing to upload to", uploadUrl, post_err.Error())
diff --git a/weed/pb/filer.proto b/weed/pb/filer.proto
index 6cd4df6b4..5cdcb6a97 100644
--- a/weed/pb/filer.proto
+++ b/weed/pb/filer.proto
@@ -139,6 +139,7 @@ message AssignVolumeResponse {
     string url = 2;
     string public_url = 3;
     int32 count = 4;
+    string auth = 5;
 }
 
 message LookupVolumeRequest {
diff --git a/weed/pb/filer_pb/filer.pb.go b/weed/pb/filer_pb/filer.pb.go
index 6b4a27c0a..920261538 100644
--- a/weed/pb/filer_pb/filer.pb.go
+++ b/weed/pb/filer_pb/filer.pb.go
@@ -574,6 +574,7 @@ type AssignVolumeResponse struct {
 	Url       string `protobuf:"bytes,2,opt,name=url" json:"url,omitempty"`
 	PublicUrl string `protobuf:"bytes,3,opt,name=public_url,json=publicUrl" json:"public_url,omitempty"`
 	Count     int32  `protobuf:"varint,4,opt,name=count" json:"count,omitempty"`
+	Auth      string `protobuf:"bytes,5,opt,name=auth" json:"auth,omitempty"`
 }
 
 func (m *AssignVolumeResponse) Reset()                    { *m = AssignVolumeResponse{} }
@@ -609,6 +610,13 @@ func (m *AssignVolumeResponse) GetCount() int32 {
 	return 0
 }
 
+func (m *AssignVolumeResponse) GetAuth() string {
+	if m != nil {
+		return m.Auth
+	}
+	return ""
+}
+
 type LookupVolumeRequest struct {
 	VolumeIds []string `protobuf:"bytes,1,rep,name=volume_ids,json=volumeIds" json:"volume_ids,omitempty"`
 }
@@ -1159,86 +1167,87 @@ var _SeaweedFiler_serviceDesc = grpc.ServiceDesc{
 func init() { proto.RegisterFile("filer.proto", fileDescriptor0) }
 
 var fileDescriptor0 = []byte{
-	// 1291 bytes of a gzipped FileDescriptorProto
-	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x09, 0x6e, 0x88, 0x02, 0xff, 0xb4, 0x57, 0x4d, 0x8f, 0xdc, 0x44,
-	0x13, 0x8e, 0xe7, 0x2b, 0xe3, 0x9a, 0x99, 0xbc, 0xbb, 0x3d, 0xfb, 0x12, 0x6b, 0xb2, 0x1b, 0x26,
-	0x86, 0xa0, 0x8d, 0x88, 0x46, 0x51, 0xe0, 0x90, 0x10, 0x21, 0x91, 0x6c, 0x36, 0x52, 0xa4, 0x4d,
-	0x82, 0xbc, 0x09, 0x12, 0xe2, 0x60, 0x79, 0xed, 0x9e, 0xa1, 0xb5, 0x1e, 0x7b, 0x70, 0xb7, 0x37,
-	0x09, 0x7f, 0x82, 0x0b, 0x57, 0x0e, 0x9c, 0xf8, 0x17, 0x5c, 0xf8, 0x3f, 0xdc, 0xb9, 0xa1, 0xae,
-	0x6e, 0x7b, 0xda, 0x63, 0xef, 0x06, 0x84, 0x72, 0xeb, 0x7e, 0xaa, 0xba, 0xbe, 0xfa, 0xe9, 0x2a,
-	0x1b, 0x06, 0x73, 0x16, 0xd3, 0x6c, 0xb6, 0xca, 0x52, 0x91, 0x92, 0x3e, 0x6e, 0xfc, 0xd5, 0x89,
-	0xfb, 0x02, 0xae, 0x1d, 0xa5, 0xe9, 0x69, 0xbe, 0x7a, 0xcc, 0x32, 0x1a, 0x8a, 0x34, 0x7b, 0x7b,
-	0x98, 0x88, 0xec, 0xad, 0x47, 0x7f, 0xc8, 0x29, 0x17, 0x64, 0x17, 0xec, 0xa8, 0x10, 0x38, 0xd6,
-	0xd4, 0xda, 0xb7, 0xbd, 0x35, 0x40, 0x08, 0x74, 0x92, 0x60, 0x49, 0x9d, 0x16, 0x0a, 0x70, 0xed,
-	0x1e, 0xc2, 0x6e, 0xb3, 0x41, 0xbe, 0x4a, 0x13, 0x4e, 0xc9, 0x4d, 0xe8, 0x52, 0x09, 0xa0, 0xb5,
-	0xc1, 0xdd, 0xff, 0xcd, 0x8a, 0x50, 0x66, 0x4a, 0x4f, 0x49, 0xdd, 0xdf, 0x2d, 0x20, 0x47, 0x8c,
-	0x0b, 0x09, 0x32, 0xca, 0xff, 0x59, 0x3c, 0x1f, 0x40, 0x6f, 0x95, 0xd1, 0x39, 0x7b, 0xa3, 0x23,
-	0xd2, 0x3b, 0x72, 0x1b, 0xb6, 0xb9, 0x08, 0x32, 0xf1, 0x24, 0x4b, 0x97, 0x4f, 0x58, 0x4c, 0x9f,
-	0xcb, 0xa0, 0xdb, 0xa8, 0x52, 0x17, 0x90, 0x19, 0x10, 0x96, 0x84, 0x71, 0xce, 0xd9, 0x19, 0x3d,
-	0x2e, 0xa4, 0x4e, 0x67, 0x6a, 0xed, 0xf7, 0xbd, 0x06, 0x09, 0xd9, 0x81, 0x6e, 0xcc, 0x96, 0x4c,
-	0x38, 0xdd, 0xa9, 0xb5, 0x3f, 0xf2, 0xd4, 0xc6, 0xfd, 0x0a, 0xc6, 0x95, 0xf8, 0x75, 0xfa, 0xb7,
-	0xe0, 0x32, 0x55, 0x90, 0x63, 0x4d, 0xdb, 0x4d, 0x05, 0x28, 0xe4, 0xee, 0x2f, 0x2d, 0xe8, 0x22,
-	0x54, 0xd6, 0xd9, 0x5a, 0xd7, 0x99, 0xdc, 0x80, 0x21, 0xe3, 0xfe, 0xba, 0x18, 0x2d, 0x8c, 0x6f,
-	0xc0, 0x78, 0x59, 0x77, 0xf2, 0x29, 0xf4, 0xc2, 0xef, 0xf3, 0xe4, 0x94, 0x3b, 0x6d, 0x74, 0x35,
-	0x5e, 0xbb, 0x92, 0xc9, 0x1e, 0x48, 0x99, 0xa7, 0x55, 0xc8, 0x3d, 0x80, 0x40, 0x88, 0x8c, 0x9d,
-	0xe4, 0x82, 0x72, 0xcc, 0x76, 0x70, 0xd7, 0x31, 0x0e, 0xe4, 0x9c, 0x3e, 0x2c, 0xe5, 0x9e, 0xa1,
-	0x4b, 0xee, 0x43, 0x9f, 0xbe, 0x11, 0x34, 0x89, 0x68, 0xe4, 0x74, 0xd1, 0xd1, 0xde, 0x46, 0x4e,
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 }
diff --git a/weed/pb/master.proto b/weed/pb/master.proto
index 544160c06..f03d1e3de 100644
--- a/weed/pb/master.proto
+++ b/weed/pb/master.proto
@@ -36,7 +36,6 @@ message Heartbeat {
 
 message HeartbeatResponse {
     uint64 volumeSizeLimit = 1;
-    string secretKey = 2;
     string leader = 3;
 }
 
@@ -109,6 +108,7 @@ message AssignResponse {
     string public_url = 3;
     uint64 count = 4;
     string error = 5;
+    string auth = 6;
 }
 
 message StatisticsRequest {
diff --git a/weed/pb/master_pb/master.pb.go b/weed/pb/master_pb/master.pb.go
index 894f08471..0c73ff2c8 100644
--- a/weed/pb/master_pb/master.pb.go
+++ b/weed/pb/master_pb/master.pb.go
@@ -145,7 +145,6 @@ func (m *Heartbeat) GetDeletedVids() []uint32 {
 
 type HeartbeatResponse struct {
 	VolumeSizeLimit uint64 `protobuf:"varint,1,opt,name=volumeSizeLimit" json:"volumeSizeLimit,omitempty"`
-	SecretKey       string `protobuf:"bytes,2,opt,name=secretKey" json:"secretKey,omitempty"`
 	Leader          string `protobuf:"bytes,3,opt,name=leader" json:"leader,omitempty"`
 }
 
@@ -161,13 +160,6 @@ func (m *HeartbeatResponse) GetVolumeSizeLimit() uint64 {
 	return 0
 }
 
-func (m *HeartbeatResponse) GetSecretKey() string {
-	if m != nil {
-		return m.SecretKey
-	}
-	return ""
-}
-
 func (m *HeartbeatResponse) GetLeader() string {
 	if m != nil {
 		return m.Leader
@@ -545,6 +537,7 @@ type AssignResponse struct {
 	PublicUrl string `protobuf:"bytes,3,opt,name=public_url,json=publicUrl" json:"public_url,omitempty"`
 	Count     uint64 `protobuf:"varint,4,opt,name=count" json:"count,omitempty"`
 	Error     string `protobuf:"bytes,5,opt,name=error" json:"error,omitempty"`
+	Auth      string `protobuf:"bytes,6,opt,name=auth" json:"auth,omitempty"`
 }
 
 func (m *AssignResponse) Reset()                    { *m = AssignResponse{} }
@@ -587,6 +580,13 @@ func (m *AssignResponse) GetError() string {
 	return ""
 }
 
+func (m *AssignResponse) GetAuth() string {
+	if m != nil {
+		return m.Auth
+	}
+	return ""
+}
+
 type StatisticsRequest struct {
 	Replication string `protobuf:"bytes,1,opt,name=replication" json:"replication,omitempty"`
 	Collection  string `protobuf:"bytes,2,opt,name=collection" json:"collection,omitempty"`
@@ -966,71 +966,71 @@ var _Seaweed_serviceDesc = grpc.ServiceDesc{
 func init() { proto.RegisterFile("master.proto", fileDescriptor0) }
 
 var fileDescriptor0 = []byte{
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+	0x27, 0x04, 0xba, 0x79, 0x56, 0x08, 0xd7, 0x9e, 0x59, 0xf3, 0xb1, 0xaf, 0xc6, 0xe4, 0x29, 0x40,
+	0x5e, 0x9e, 0xc7, 0x2c, 0x0c, 0xca, 0x22, 0x76, 0x3b, 0xca, 0xd6, 0xd1, 0xc8, 0xeb, 0x22, 0x26,
+	0x73, 0x98, 0x24, 0x74, 0x11, 0x5c, 0x67, 0x71, 0x99, 0x60, 0x10, 0x66, 0x65, 0x2a, 0xdc, 0xae,
+	0xda, 0xbe, 0x95, 0xd0, 0xc5, 0x1b, 0x05, 0x1f, 0x48, 0x94, 0xcc, 0x64, 0x54, 0x8b, 0xe0, 0x82,
+	0xc5, 0x18, 0x5c, 0xe1, 0xd2, 0xed, 0xcd, 0xac, 0x79, 0xd7, 0x87, 0x84, 0x2e, 0xbe, 0x64, 0x31,
+	0x1e, 0xe3, 0x92, 0x3c, 0x87, 0x51, 0x44, 0x05, 0x0d, 0x42, 0x4c, 0x05, 0x16, 0x6e, 0x5f, 0xf9,
+	0x02, 0x09, 0x1d, 0x28, 0x44, 0xc6, 0x57, 0xd0, 0xf0, 0xca, 0x1d, 0xa8, 0x15, 0x35, 0x96, 0xf1,
+	0xd1, 0x28, 0x61, 0x69, 0xa0, 0x22, 0x1f, 0x2a, 0xd7, 0x8e, 0x42, 0x4e, 0x65, 0xf8, 0x9f, 0xc1,
+	0x40, 0xc7, 0xc6, 0x5d, 0x67, 0xd6, 0x99, 0x8f, 0xf6, 0xdf, 0xdf, 0xab, 0xd9, 0xd8, 0xd3, 0xe1,
+	0x1d, 0xa5, 0x17, 0x59, 0x91, 0x50, 0xc1, 0xb2, 0xf4, 0x6b, 0xe4, 0x9c, 0x5e, 0xa2, 0x5f, 0xed,
+	0x21, 0x8f, 0x61, 0x98, 0xe2, 0x4d, 0x70, 0xcd, 0x22, 0xee, 0xc2, 0xac, 0x33, 0x1f, 0xfb, 0x83,
+	0x14, 0x6f, 0xde, 0xb0, 0x88, 0x93, 0xf7, 0x60, 0x33, 0xc2, 0x18, 0x05, 0x46, 0x7a, 0x79, 0xa4,
+	0x96, 0x47, 0x06, 0x93, 0x26, 0xde, 0x6b, 0xd8, 0xae, 0xc9, 0xf6, 0x91, 0xe7, 0x59, 0xca, 0x91,
+	0xcc, 0xe1, 0x91, 0x3e, 0xfd, 0x8c, 0xbd, 0xc5, 0x13, 0x96, 0x30, 0xa1, 0x14, 0xe8, 0xfa, 0x6d,
+	0x98, 0xbc, 0x03, 0xfd, 0x18, 0x69, 0x84, 0x85, 0xa1, 0xdd, 0xcc, 0xbc, 0x3f, 0x6c, 0x70, 0xd7,
+	0x85, 0xae, 0x34, 0x8d, 0xd4, 0x89, 0x63, 0xdf, 0x66, 0x91, 0xe4, 0x8c, 0xb3, 0xb7, 0xa8, 0x34,
+	0xed, 0xfa, 0x6a, 0x4c, 0x9e, 0x01, 0x84, 0x59, 0x1c, 0x63, 0x28, 0x37, 0x9a, 0xc3, 0x1b, 0x88,
+	0xe4, 0x54, 0xc9, 0x74, 0x2b, 0x67, 0xd7, 0x77, 0x24, 0xa2, 0x95, 0xac, 0x6f, 0x6e, 0x0c, 0xb4,
+	0x92, 0xe6, 0xe6, 0xda, 0xe4, 0x23, 0x20, 0x15, 0x39, 0xe7, 0xcb, 0xda, 0xb0, 0xaf, 0x0c, 0x27,
+	0x66, 0xe5, 0xe5, 0xb2, 0xb2, 0x7e, 0x02, 0x4e, 0x81, 0x34, 0x0a, 0xb2, 0x34, 0x5e, 0x2a, 0x71,
+	0x87, 0xfe, 0x50, 0x02, 0xaf, 0xd2, 0x78, 0x49, 0x3e, 0x84, 0xed, 0x02, 0xf3, 0x98, 0x85, 0x34,
+	0xc8, 0x63, 0x1a, 0x62, 0x82, 0x69, 0xa5, 0xf3, 0xc4, 0x2c, 0x9c, 0x56, 0x38, 0x71, 0x61, 0x70,
+	0x8d, 0x05, 0x97, 0xd7, 0x72, 0x94, 0x49, 0x35, 0x25, 0x13, 0xe8, 0x08, 0x11, 0xbb, 0xa0, 0x50,
+	0x39, 0xf4, 0x06, 0xd0, 0x3b, 0x4c, 0x72, 0xb1, 0xf4, 0x7e, 0xb3, 0xe0, 0xd1, 0x59, 0x99, 0x63,
+	0xf1, 0x32, 0xce, 0xc2, 0xab, 0xc3, 0x85, 0x28, 0x28, 0x79, 0x05, 0x5b, 0x58, 0x50, 0x5e, 0x16,
+	0x32, 0xf6, 0x88, 0xa5, 0x97, 0x8a, 0xd2, 0xd1, 0xfe, 0xbc, 0x91, 0x3e, 0xad, 0x3d, 0x7b, 0x87,
+	0x7a, 0xc3, 0x81, 0xb2, 0xf7, 0xc7, 0xd8, 0x9c, 0x4e, 0xbf, 0x87, 0xf1, 0xca, 0xba, 0x14, 0x46,
+	0xa6, 0xb6, 0x91, 0x4a, 0x8d, 0xa5, 0xe2, 0x39, 0x2d, 0x98, 0x58, 0x9a, 0x12, 0x34, 0x33, 0x29,
+	0x88, 0xa9, 0x30, 0x99, 0x69, 0x1d, 0x95, 0x69, 0x8e, 0x46, 0x8e, 0x22, 0xee, 0x7d, 0x00, 0x3b,
+	0x07, 0x31, 0xc3, 0x54, 0x9c, 0x30, 0x2e, 0x30, 0xf5, 0xf1, 0xa7, 0x12, 0xb9, 0x90, 0x1e, 0x52,
+	0x9a, 0xa0, 0x29, 0x70, 0x35, 0xf6, 0x7e, 0x86, 0x2d, 0x9d, 0x3a, 0x27, 0x59, 0xa8, 0xf2, 0x46,
+	0x12, 0x23, 0x2b, 0x5b, 0x1b, 0xc9, 0x61, 0xab, 0xe4, 0xed, 0x76, 0xc9, 0x37, 0x6b, 0xa2, 0xf3,
+	0xef, 0x35, 0xd1, 0xbd, 0x5b, 0x13, 0xdf, 0xc1, 0xce, 0x49, 0x96, 0x5d, 0x95, 0xb9, 0x0e, 0xa3,
+	0x8a, 0x75, 0xf5, 0x86, 0xd6, 0xac, 0x23, 0x7d, 0xd6, 0x37, 0x6c, 0x65, 0xac, 0xdd, 0xce, 0x58,
+	0xef, 0x6f, 0x0b, 0x76, 0x57, 0x8f, 0x35, 0xd5, 0xf6, 0x03, 0xec, 0xd4, 0xe7, 0x06, 0xb1, 0xb9,
+	0xb3, 0x76, 0x30, 0xda, 0x7f, 0xd1, 0x10, 0xf3, 0xbe, 0xdd, 0x55, 0x83, 0x88, 0x2a, 0xb2, 0xfc,
+	0xed, 0xeb, 0x16, 0xc2, 0xa7, 0x0b, 0x98, 0xb4, 0xcd, 0x64, 0x42, 0xd7, 0x5e, 0x0d, 0xb3, 0xc3,
+	0x6a, 0x27, 0xf9, 0x18, 0x9c, 0xdb, 0x40, 0x6c, 0x15, 0xc8, 0xce, 0x4a, 0x20, 0xc6, 0xd7, 0xad,
+	0x15, 0xd9, 0x85, 0x1e, 0x16, 0x45, 0x56, 0x35, 0x02, 0x3d, 0xf1, 0x3e, 0x85, 0xe1, 0x7f, 0x56,
+	0xd1, 0xfb, 0xd3, 0x82, 0xf1, 0x17, 0x9c, 0xb3, 0xcb, 0x3a, 0x5d, 0x76, 0xa1, 0xa7, 0xcb, 0x54,
+	0xb7, 0x23, 0x3d, 0x21, 0x33, 0x18, 0x99, 0x2a, 0x6b, 0x50, 0xdf, 0x84, 0x1e, 0xec, 0x26, 0xa6,
+	0xf2, 0xba, 0x3a, 0x34, 0x21, 0xe2, 0x76, 0xa3, 0xef, 0xad, 0x6d, 0xf4, 0xfd, 0x46, 0xa3, 0x7f,
+	0x02, 0x8e, 0xda, 0x94, 0x66, 0x11, 0x9a, 0x17, 0x60, 0x28, 0x81, 0x6f, 0xb2, 0x08, 0xbd, 0x5f,
+	0x2d, 0xd8, 0xaa, 0x6e, 0x63, 0x94, 0x9f, 0x40, 0xe7, 0xa2, 0x66, 0x5f, 0x0e, 0x2b, 0x8e, 0xec,
+	0x75, 0x1c, 0xdd, 0x79, 0xdc, 0x6a, 0x46, 0xba, 0x4d, 0x46, 0x6a, 0x31, 0x7a, 0x0d, 0x31, 0x64,
+	0xc8, 0xb4, 0x14, 0x3f, 0x56, 0x21, 0xcb, 0xb1, 0x77, 0x09, 0xdb, 0x67, 0x82, 0x0a, 0xc6, 0x05,
+	0x0b, 0x79, 0x45, 0x73, 0x8b, 0x50, 0xeb, 0x21, 0x42, 0xed, 0x75, 0x84, 0x76, 0x6a, 0x42, 0xbd,
+	0xdf, 0x2d, 0x20, 0x4d, 0x4f, 0x86, 0x82, 0xff, 0xc1, 0x95, 0xa4, 0x4c, 0x64, 0x82, 0xc6, 0x81,
+	0x7a, 0x55, 0xcc, 0xdb, 0xa0, 0x10, 0xf9, 0x70, 0x49, 0x95, 0x4a, 0x8e, 0x91, 0x5e, 0xd5, 0x0f,
+	0xc3, 0x50, 0x02, 0x6a, 0x71, 0xf5, 0x5d, 0xe9, 0xb7, 0xde, 0x95, 0xfd, 0x5f, 0x3a, 0x30, 0x38,
+	0x43, 0x7a, 0x83, 0x18, 0x91, 0x23, 0x18, 0x9f, 0x61, 0x1a, 0xdd, 0xfe, 0x55, 0x76, 0x1b, 0x25,
+	0x52, 0xa3, 0xd3, 0x77, 0xef, 0x43, 0xab, 0xfb, 0x7b, 0x1b, 0x73, 0xeb, 0x85, 0x45, 0x4e, 0x61,
+	0x7c, 0x8c, 0x98, 0x1f, 0x64, 0x69, 0x8a, 0xa1, 0xc0, 0x88, 0x3c, 0x6b, 0x6c, 0xba, 0xa7, 0x6f,
+	0x4e, 0x1f, 0xdf, 0xf9, 0x22, 0x54, 0x65, 0x66, 0x4e, 0xfc, 0x16, 0x36, 0x9b, 0xed, 0x62, 0xe5,
+	0xc0, 0x7b, 0x9a, 0xdb, 0xf4, 0xf9, 0x03, 0x7d, 0xc6, 0xdb, 0x20, 0x9f, 0x43, 0x5f, 0xe7, 0x2f,
+	0x71, 0x1b, 0xc6, 0x2b, 0x05, 0xba, 0x12, 0xd7, 0x6a, 0xb2, 0x7b, 0x1b, 0xe4, 0x18, 0xe0, 0x36,
+	0x03, 0x48, 0x93, 0x97, 0x3b, 0x29, 0x38, 0x7d, 0xba, 0x66, 0xb5, 0x3a, 0xec, 0xbc, 0xaf, 0x3e,
+	0x8e, 0x9f, 0xfc, 0x13, 0x00, 0x00, 0xff, 0xff, 0x25, 0xfc, 0xb7, 0x54, 0x48, 0x0a, 0x00, 0x00,
 }
diff --git a/weed/replication/sink/filersink/fetch_write.go b/weed/replication/sink/filersink/fetch_write.go
index c14566723..f1306ca4c 100644
--- a/weed/replication/sink/filersink/fetch_write.go
+++ b/weed/replication/sink/filersink/fetch_write.go
@@ -9,6 +9,7 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/glog"
 	"github.com/chrislusf/seaweedfs/weed/operation"
 	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
+	"github.com/chrislusf/seaweedfs/weed/security"
 	"github.com/chrislusf/seaweedfs/weed/util"
 )
 
@@ -59,6 +60,7 @@ func (fs *FilerSink) fetchAndWrite(sourceChunk *filer_pb.FileChunk) (fileId stri
 	defer readCloser.Close()
 
 	var host string
+	var auth security.EncodedJwt
 
 	if err := fs.withFilerClient(func(client filer_pb.SeaweedFilerClient) error {
 
@@ -76,7 +78,7 @@ func (fs *FilerSink) fetchAndWrite(sourceChunk *filer_pb.FileChunk) (fileId stri
 			return err
 		}
 
-		fileId, host = resp.FileId, resp.Url
+		fileId, host, auth = resp.FileId, resp.Url, security.EncodedJwt(resp.Auth)
 
 		return nil
 	}); err != nil {
@@ -88,7 +90,7 @@ func (fs *FilerSink) fetchAndWrite(sourceChunk *filer_pb.FileChunk) (fileId stri
 	glog.V(4).Infof("replicating %s to %s header:%+v", filename, fileUrl, header)
 
 	uploadResult, err := operation.Upload(fileUrl, filename, readCloser,
-		"gzip" == header.Get("Content-Encoding"), header.Get("Content-Type"), nil, "")
+		"gzip" == header.Get("Content-Encoding"), header.Get("Content-Type"), nil, auth)
 	if err != nil {
 		glog.V(0).Infof("upload data %v to %s: %v", filename, fileUrl, err)
 		return "", fmt.Errorf("upload data: %v", err)
@@ -103,7 +105,7 @@ func (fs *FilerSink) fetchAndWrite(sourceChunk *filer_pb.FileChunk) (fileId stri
 
 func (fs *FilerSink) withFilerClient(fn func(filer_pb.SeaweedFilerClient) error) error {
 
-	grpcConnection, err := util.GrpcDial(fs.grpcAddress)
+	grpcConnection, err := util.GrpcDial(fs.grpcAddress, fs.grpcDialOption)
 	if err != nil {
 		return fmt.Errorf("fail to dial %s: %v", fs.grpcAddress, err)
 	}
diff --git a/weed/replication/sink/filersink/filer_sink.go b/weed/replication/sink/filersink/filer_sink.go
index 2e9cc86d1..2eb326b83 100644
--- a/weed/replication/sink/filersink/filer_sink.go
+++ b/weed/replication/sink/filersink/filer_sink.go
@@ -3,6 +3,9 @@ package filersink
 import (
 	"context"
 	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/security"
+	"github.com/spf13/viper"
+	"google.golang.org/grpc"
 
 	"github.com/chrislusf/seaweedfs/weed/filer2"
 	"github.com/chrislusf/seaweedfs/weed/glog"
@@ -13,13 +16,14 @@ import (
 )
 
 type FilerSink struct {
-	filerSource *source.FilerSource
-	grpcAddress string
-	dir         string
-	replication string
-	collection  string
-	ttlSec      int32
-	dataCenter  string
+	filerSource    *source.FilerSource
+	grpcAddress    string
+	dir            string
+	replication    string
+	collection     string
+	ttlSec         int32
+	dataCenter     string
+	grpcDialOption grpc.DialOption
 }
 
 func init() {
@@ -55,6 +59,7 @@ func (fs *FilerSink) initialize(grpcAddress string, dir string,
 	fs.replication = replication
 	fs.collection = collection
 	fs.ttlSec = int32(ttlSec)
+	fs.grpcDialOption = security.LoadClientTLS(viper.Sub("grpc"), "client")
 	return nil
 }
 
diff --git a/weed/replication/source/filer_source.go b/weed/replication/source/filer_source.go
index efe71e706..92c2d203d 100644
--- a/weed/replication/source/filer_source.go
+++ b/weed/replication/source/filer_source.go
@@ -3,6 +3,9 @@ package source
 import (
 	"context"
 	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/security"
+	"github.com/spf13/viper"
+	"google.golang.org/grpc"
 	"io"
 	"net/http"
 	"strings"
@@ -17,8 +20,9 @@ type ReplicationSource interface {
 }
 
 type FilerSource struct {
-	grpcAddress string
-	Dir         string
+	grpcAddress    string
+	grpcDialOption grpc.DialOption
+	Dir            string
 }
 
 func (fs *FilerSource) Initialize(configuration util.Configuration) error {
@@ -31,6 +35,7 @@ func (fs *FilerSource) Initialize(configuration util.Configuration) error {
 func (fs *FilerSource) initialize(grpcAddress string, dir string) (err error) {
 	fs.grpcAddress = grpcAddress
 	fs.Dir = dir
+	fs.grpcDialOption = security.LoadClientTLS(viper.Sub("grpc"), "client")
 	return nil
 }
 
@@ -40,7 +45,7 @@ func (fs *FilerSource) LookupFileId(part string) (fileUrl string, err error) {
 
 	vid := volumeId(part)
 
-	err = fs.withFilerClient(func(client filer_pb.SeaweedFilerClient) error {
+	err = fs.withFilerClient(fs.grpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
 
 		glog.V(4).Infof("read lookup volume id locations: %v", vid)
 		resp, err := client.LookupVolume(context.Background(), &filer_pb.LookupVolumeRequest{
@@ -84,9 +89,9 @@ func (fs *FilerSource) ReadPart(part string) (filename string, header http.Heade
 	return filename, header, readCloser, err
 }
 
-func (fs *FilerSource) withFilerClient(fn func(filer_pb.SeaweedFilerClient) error) error {
+func (fs *FilerSource) withFilerClient(grpcDialOption grpc.DialOption, fn func(filer_pb.SeaweedFilerClient) error) error {
 
-	grpcConnection, err := util.GrpcDial(fs.grpcAddress)
+	grpcConnection, err := util.GrpcDial(fs.grpcAddress, grpcDialOption)
 	if err != nil {
 		return fmt.Errorf("fail to dial %s: %v", fs.grpcAddress, err)
 	}
diff --git a/weed/s3api/s3api_handlers.go b/weed/s3api/s3api_handlers.go
index 286398310..5d92085cc 100644
--- a/weed/s3api/s3api_handlers.go
+++ b/weed/s3api/s3api_handlers.go
@@ -37,7 +37,7 @@ func encodeResponse(response interface{}) []byte {
 
 func (s3a *S3ApiServer) withFilerClient(fn func(filer_pb.SeaweedFilerClient) error) error {
 
-	grpcConnection, err := util.GrpcDial(s3a.option.FilerGrpcAddress)
+	grpcConnection, err := util.GrpcDial(s3a.option.FilerGrpcAddress, s3a.option.GrpcDialOption)
 	if err != nil {
 		return fmt.Errorf("fail to dial %s: %v", s3a.option.FilerGrpcAddress, err)
 	}
diff --git a/weed/s3api/s3api_server.go b/weed/s3api/s3api_server.go
index db798a546..24458592d 100644
--- a/weed/s3api/s3api_server.go
+++ b/weed/s3api/s3api_server.go
@@ -8,6 +8,7 @@ import (
 	_ "github.com/chrislusf/seaweedfs/weed/filer2/postgres"
 	_ "github.com/chrislusf/seaweedfs/weed/filer2/redis"
 	"github.com/gorilla/mux"
+	"google.golang.org/grpc"
 	"net/http"
 )
 
@@ -16,6 +17,7 @@ type S3ApiServerOption struct {
 	FilerGrpcAddress string
 	DomainName       string
 	BucketsPath      string
+	GrpcDialOption   grpc.DialOption
 }
 
 type S3ApiServer struct {
diff --git a/weed/security/guard.go b/weed/security/guard.go
index fd9c8e0b3..84a415253 100644
--- a/weed/security/guard.go
+++ b/weed/security/guard.go
@@ -41,21 +41,21 @@ https://github.com/pkieltyka/jwtauth/blob/master/jwtauth.go
 
 */
 type Guard struct {
-	whiteList []string
-	SecretKey Secret
+	whiteList  []string
+	SigningKey SigningKey
 
 	isActive bool
 }
 
-func NewGuard(whiteList []string, secretKey string) *Guard {
-	g := &Guard{whiteList: whiteList, SecretKey: Secret(secretKey)}
-	g.isActive = len(g.whiteList) != 0 || len(g.SecretKey) != 0
+func NewGuard(whiteList []string, signingKey string) *Guard {
+	g := &Guard{whiteList: whiteList, SigningKey: SigningKey(signingKey)}
+	g.isActive = len(g.whiteList) != 0 || len(g.SigningKey) != 0
 	return g
 }
 
 func (g *Guard) WhiteList(f func(w http.ResponseWriter, r *http.Request)) func(w http.ResponseWriter, r *http.Request) {
 	if !g.isActive {
-		//if no security needed, just skip all checkings
+		//if no security needed, just skip all checking
 		return f
 	}
 	return func(w http.ResponseWriter, r *http.Request) {
@@ -67,20 +67,6 @@ func (g *Guard) WhiteList(f func(w http.ResponseWriter, r *http.Request)) func(w
 	}
 }
 
-func (g *Guard) Secure(f func(w http.ResponseWriter, r *http.Request)) func(w http.ResponseWriter, r *http.Request) {
-	if !g.isActive {
-		//if no security needed, just skip all checkings
-		return f
-	}
-	return func(w http.ResponseWriter, r *http.Request) {
-		if err := g.checkJwt(w, r); err != nil {
-			w.WriteHeader(http.StatusUnauthorized)
-			return
-		}
-		f(w, r)
-	}
-}
-
 func GetActualRemoteHost(r *http.Request) (host string, err error) {
 	host = r.Header.Get("HTTP_X_FORWARDED_FOR")
 	if host == "" {
@@ -130,33 +116,3 @@ func (g *Guard) checkWhiteList(w http.ResponseWriter, r *http.Request) error {
 	glog.V(0).Infof("Not in whitelist: %s", r.RemoteAddr)
 	return fmt.Errorf("Not in whitelis: %s", r.RemoteAddr)
 }
-
-func (g *Guard) checkJwt(w http.ResponseWriter, r *http.Request) error {
-	if g.checkWhiteList(w, r) == nil {
-		return nil
-	}
-
-	if len(g.SecretKey) == 0 {
-		return nil
-	}
-
-	tokenStr := GetJwt(r)
-
-	if tokenStr == "" {
-		return ErrUnauthorized
-	}
-
-	// Verify the token
-	token, err := DecodeJwt(g.SecretKey, tokenStr)
-	if err != nil {
-		glog.V(1).Infof("Token verification error from %s: %v", r.RemoteAddr, err)
-		return ErrUnauthorized
-	}
-	if !token.Valid {
-		glog.V(1).Infof("Token invliad from %s: %v", r.RemoteAddr, tokenStr)
-		return ErrUnauthorized
-	}
-
-	glog.V(1).Infof("No permission from %s", r.RemoteAddr)
-	return fmt.Errorf("No write permission from %s", r.RemoteAddr)
-}
diff --git a/weed/security/jwt.go b/weed/security/jwt.go
index 46b7efaaf..45a77f093 100644
--- a/weed/security/jwt.go
+++ b/weed/security/jwt.go
@@ -1,9 +1,9 @@
 package security
 
 import (
+	"fmt"
 	"net/http"
 	"strings"
-
 	"time"
 
 	"github.com/chrislusf/seaweedfs/weed/glog"
@@ -11,21 +11,28 @@ import (
 )
 
 type EncodedJwt string
-type Secret string
+type SigningKey []byte
 
-func GenJwt(secret Secret, fileId string) EncodedJwt {
-	if secret == "" {
+type SeaweedFileIdClaims struct {
+	Fid string `json:"fid"`
+	jwt.StandardClaims
+}
+
+func GenJwt(signingKey SigningKey, fileId string) EncodedJwt {
+	if len(signingKey) == 0 {
 		return ""
 	}
 
-	t := jwt.New(jwt.GetSigningMethod("HS256"))
-	t.Claims = &jwt.StandardClaims{
-		ExpiresAt: time.Now().Add(time.Second * 10).Unix(),
-		Subject:   fileId,
+	claims := SeaweedFileIdClaims{
+		fileId,
+		jwt.StandardClaims{
+			ExpiresAt: time.Now().Add(time.Second * 10).Unix(),
+		},
 	}
-	encoded, e := t.SignedString(secret)
+	t := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
+	encoded, e := t.SignedString([]byte(signingKey))
 	if e != nil {
-		glog.V(0).Infof("Failed to sign claims: %v", t.Claims)
+		glog.V(0).Infof("Failed to sign claims %+v: %v", t.Claims, e)
 		return ""
 	}
 	return EncodedJwt(encoded)
@@ -44,31 +51,15 @@ func GetJwt(r *http.Request) EncodedJwt {
 		}
 	}
 
-	// Get token from cookie
-	if tokenStr == "" {
-		cookie, err := r.Cookie("jwt")
-		if err == nil {
-			tokenStr = cookie.Value
-		}
-	}
-
 	return EncodedJwt(tokenStr)
 }
 
-func EncodeJwt(secret Secret, claims *jwt.StandardClaims) (EncodedJwt, error) {
-	if secret == "" {
-		return "", nil
-	}
-
-	t := jwt.New(jwt.GetSigningMethod("HS256"))
-	t.Claims = claims
-	encoded, e := t.SignedString(secret)
-	return EncodedJwt(encoded), e
-}
-
-func DecodeJwt(secret Secret, tokenString EncodedJwt) (token *jwt.Token, err error) {
+func DecodeJwt(signingKey SigningKey, tokenString EncodedJwt) (token *jwt.Token, err error) {
 	// check exp, nbf
-	return jwt.Parse(string(tokenString), func(token *jwt.Token) (interface{}, error) {
-		return secret, nil
+	return jwt.ParseWithClaims(string(tokenString), &SeaweedFileIdClaims{}, func(token *jwt.Token) (interface{}, error) {
+		if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
+			return nil, fmt.Errorf("unknown token method")
+		}
+		return []byte(signingKey), nil
 	})
 }
diff --git a/weed/security/tls.go b/weed/security/tls.go
new file mode 100644
index 000000000..e81ba4831
--- /dev/null
+++ b/weed/security/tls.go
@@ -0,0 +1,66 @@
+package security
+
+import (
+	"crypto/tls"
+	"crypto/x509"
+	"github.com/spf13/viper"
+	"io/ioutil"
+
+	"github.com/chrislusf/seaweedfs/weed/glog"
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/credentials"
+)
+
+func LoadServerTLS(config *viper.Viper, component string) grpc.ServerOption {
+	if config == nil {
+		return nil
+	}
+
+	// load cert/key, ca cert
+	cert, err := tls.LoadX509KeyPair(config.GetString(component+".cert"), config.GetString(component+".key"))
+	if err != nil {
+		glog.Errorf("load cert/key error: %v", err)
+		return nil
+	}
+	caCert, err := ioutil.ReadFile(config.GetString("ca"))
+	if err != nil {
+		glog.Errorf("read ca cert file error: %v", err)
+		return nil
+	}
+	caCertPool := x509.NewCertPool()
+	caCertPool.AppendCertsFromPEM(caCert)
+	ta := credentials.NewTLS(&tls.Config{
+		Certificates: []tls.Certificate{cert},
+		ClientCAs:    caCertPool,
+		ClientAuth:   tls.RequireAndVerifyClientCert,
+	})
+
+	return grpc.Creds(ta)
+}
+
+func LoadClientTLS(config *viper.Viper, component string) grpc.DialOption {
+	if config == nil {
+		return grpc.WithInsecure()
+	}
+
+	// load cert/key, cacert
+	cert, err := tls.LoadX509KeyPair(config.GetString(component+".cert"), config.GetString(component+".key"))
+	if err != nil {
+		glog.Errorf("load cert/key error: %v", err)
+		return grpc.WithInsecure()
+	}
+	caCert, err := ioutil.ReadFile(config.GetString("ca"))
+	if err != nil {
+		glog.Errorf("read ca cert file error: %v", err)
+		return grpc.WithInsecure()
+	}
+	caCertPool := x509.NewCertPool()
+	caCertPool.AppendCertsFromPEM(caCert)
+
+	ta := credentials.NewTLS(&tls.Config{
+		Certificates:       []tls.Certificate{cert},
+		RootCAs:            caCertPool,
+		InsecureSkipVerify: true,
+	})
+	return grpc.WithTransportCredentials(ta)
+}
diff --git a/weed/server/common.go b/weed/server/common.go
index d88abfdc8..1c75d44cf 100644
--- a/weed/server/common.go
+++ b/weed/server/common.go
@@ -5,6 +5,7 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
+	"google.golang.org/grpc"
 	"net/http"
 	"path/filepath"
 	"strconv"
@@ -13,7 +14,6 @@ import (
 
 	"github.com/chrislusf/seaweedfs/weed/glog"
 	"github.com/chrislusf/seaweedfs/weed/operation"
-	"github.com/chrislusf/seaweedfs/weed/security"
 	"github.com/chrislusf/seaweedfs/weed/stats"
 	"github.com/chrislusf/seaweedfs/weed/storage"
 	"github.com/chrislusf/seaweedfs/weed/util"
@@ -82,8 +82,7 @@ func debug(params ...interface{}) {
 	glog.V(4).Infoln(params...)
 }
 
-func submitForClientHandler(w http.ResponseWriter, r *http.Request, masterUrl string) {
-	jwt := security.GetJwt(r)
+func submitForClientHandler(w http.ResponseWriter, r *http.Request, masterUrl string, grpcDialOption grpc.DialOption) {
 	m := make(map[string]interface{})
 	if r.Method != "POST" {
 		writeJsonError(w, r, http.StatusMethodNotAllowed, errors.New("Only submit via POST!"))
@@ -113,7 +112,7 @@ func submitForClientHandler(w http.ResponseWriter, r *http.Request, masterUrl st
 		Collection:  r.FormValue("collection"),
 		Ttl:         r.FormValue("ttl"),
 	}
-	assignResult, ae := operation.Assign(masterUrl, ar)
+	assignResult, ae := operation.Assign(masterUrl, grpcDialOption, ar)
 	if ae != nil {
 		writeJsonError(w, r, http.StatusInternalServerError, ae)
 		return
@@ -125,7 +124,7 @@ func submitForClientHandler(w http.ResponseWriter, r *http.Request, masterUrl st
 	}
 
 	debug("upload file to store", url)
-	uploadResult, err := operation.Upload(url, fname, bytes.NewReader(data), isGzipped, mimeType, pairMap, jwt)
+	uploadResult, err := operation.Upload(url, fname, bytes.NewReader(data), isGzipped, mimeType, pairMap, assignResult.Auth)
 	if err != nil {
 		writeJsonError(w, r, http.StatusInternalServerError, err)
 		return
diff --git a/weed/server/filer_grpc_server.go b/weed/server/filer_grpc_server.go
index 06589e3c6..4f1377331 100644
--- a/weed/server/filer_grpc_server.go
+++ b/weed/server/filer_grpc_server.go
@@ -220,7 +220,7 @@ func (fs *FilerServer) AssignVolume(ctx context.Context, req *filer_pb.AssignVol
 			DataCenter:  "",
 		}
 	}
-	assignResult, err := operation.Assign(fs.filer.GetMaster(), assignRequest, altRequest)
+	assignResult, err := operation.Assign(fs.filer.GetMaster(), fs.grpcDialOption, assignRequest, altRequest)
 	if err != nil {
 		return nil, fmt.Errorf("assign volume: %v", err)
 	}
@@ -233,6 +233,7 @@ func (fs *FilerServer) AssignVolume(ctx context.Context, req *filer_pb.AssignVol
 		Count:     int32(assignResult.Count),
 		Url:       assignResult.Url,
 		PublicUrl: assignResult.PublicUrl,
+		Auth:      string(assignResult.Auth),
 	}, err
 }
 
@@ -253,7 +254,7 @@ func (fs *FilerServer) Statistics(ctx context.Context, req *filer_pb.StatisticsR
 		Ttl:         req.Ttl,
 	}
 
-	output, err := operation.Statistics(fs.filer.GetMaster(), input)
+	output, err := operation.Statistics(fs.filer.GetMaster(), fs.grpcDialOption, input)
 	if err != nil {
 		return nil, err
 	}
diff --git a/weed/server/filer_server.go b/weed/server/filer_server.go
index 9d70e4dac..2ace0a7ea 100644
--- a/weed/server/filer_server.go
+++ b/weed/server/filer_server.go
@@ -1,6 +1,7 @@
 package weed_server
 
 import (
+	"google.golang.org/grpc"
 	"net/http"
 	"os"
 
@@ -28,29 +29,30 @@ type FilerOption struct {
 	RedirectOnRead     bool
 	DisableDirListing  bool
 	MaxMB              int
-	SecretKey          string
 	DirListingLimit    int
 	DataCenter         string
 	DefaultLevelDbDir  string
 }
 
 type FilerServer struct {
-	option *FilerOption
-	secret security.Secret
-	filer  *filer2.Filer
+	option         *FilerOption
+	secret         security.SigningKey
+	filer          *filer2.Filer
+	grpcDialOption grpc.DialOption
 }
 
 func NewFilerServer(defaultMux, readonlyMux *http.ServeMux, option *FilerOption) (fs *FilerServer, err error) {
 
 	fs = &FilerServer{
-		option: option,
+		option:         option,
+		grpcDialOption: security.LoadClientTLS(viper.Sub("grpc"), "filer"),
 	}
 
 	if len(option.Masters) == 0 {
 		glog.Fatal("master list is required!")
 	}
 
-	fs.filer = filer2.NewFiler(option.Masters)
+	fs.filer = filer2.NewFiler(option.Masters, fs.grpcDialOption)
 
 	go fs.filer.KeepConnectedToMaster()
 
diff --git a/weed/server/filer_server_handlers_write.go b/weed/server/filer_server_handlers_write.go
index 32f481e74..9e231c645 100644
--- a/weed/server/filer_server_handlers_write.go
+++ b/weed/server/filer_server_handlers_write.go
@@ -6,6 +6,7 @@ import (
 	"io/ioutil"
 	"net/http"
 	"net/url"
+	"os"
 	"strconv"
 	"strings"
 	"time"
@@ -14,8 +15,8 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/glog"
 	"github.com/chrislusf/seaweedfs/weed/operation"
 	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
+	"github.com/chrislusf/seaweedfs/weed/security"
 	"github.com/chrislusf/seaweedfs/weed/util"
-	"os"
 )
 
 var (
@@ -31,7 +32,7 @@ type FilerPostResult struct {
 	Url   string `json:"url,omitempty"`
 }
 
-func (fs *FilerServer) assignNewFileInfo(w http.ResponseWriter, r *http.Request, replication, collection string, dataCenter string) (fileId, urlLocation string, err error) {
+func (fs *FilerServer) assignNewFileInfo(w http.ResponseWriter, r *http.Request, replication, collection string, dataCenter string) (fileId, urlLocation string, auth security.EncodedJwt, err error) {
 	ar := &operation.VolumeAssignRequest{
 		Count:       1,
 		Replication: replication,
@@ -50,7 +51,7 @@ func (fs *FilerServer) assignNewFileInfo(w http.ResponseWriter, r *http.Request,
 		}
 	}
 
-	assignResult, ae := operation.Assign(fs.filer.GetMaster(), ar, altRequest)
+	assignResult, ae := operation.Assign(fs.filer.GetMaster(), fs.grpcDialOption, ar, altRequest)
 	if ae != nil {
 		glog.Errorf("failing to assign a file id: %v", ae)
 		writeJsonError(w, r, http.StatusInternalServerError, ae)
@@ -59,6 +60,7 @@ func (fs *FilerServer) assignNewFileInfo(w http.ResponseWriter, r *http.Request,
 	}
 	fileId = assignResult.Fid
 	urlLocation = "http://" + assignResult.Url + "/" + assignResult.Fid
+	auth = assignResult.Auth
 	return
 }
 
@@ -82,7 +84,7 @@ func (fs *FilerServer) PostHandler(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	fileId, urlLocation, err := fs.assignNewFileInfo(w, r, replication, collection, dataCenter)
+	fileId, urlLocation, auth, err := fs.assignNewFileInfo(w, r, replication, collection, dataCenter)
 
 	if err != nil || fileId == "" || urlLocation == "" {
 		glog.V(0).Infof("fail to allocate volume for %s, collection:%s, datacenter:%s", r.URL.Path, collection, dataCenter)
@@ -115,6 +117,9 @@ func (fs *FilerServer) PostHandler(w http.ResponseWriter, r *http.Request) {
 		Host:          r.Host,
 		ContentLength: r.ContentLength,
 	}
+	if auth != "" {
+		request.Header.Set("Authorization", "BEARER "+string(auth))
+	}
 	resp, do_err := util.Do(request)
 	if do_err != nil {
 		glog.Errorf("failing to connect to volume server %s: %v, %+v", r.RequestURI, do_err, r.Method)
diff --git a/weed/server/filer_server_handlers_write_autochunk.go b/weed/server/filer_server_handlers_write_autochunk.go
index 4b1745aaa..b9c0691c7 100644
--- a/weed/server/filer_server_handlers_write_autochunk.go
+++ b/weed/server/filer_server_handlers_write_autochunk.go
@@ -14,6 +14,7 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/glog"
 	"github.com/chrislusf/seaweedfs/weed/operation"
 	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
+	"github.com/chrislusf/seaweedfs/weed/security"
 	"github.com/chrislusf/seaweedfs/weed/util"
 )
 
@@ -105,14 +106,14 @@ func (fs *FilerServer) doAutoChunk(w http.ResponseWriter, r *http.Request, conte
 
 		if chunkBufOffset >= chunkSize || readFully || (chunkBufOffset > 0 && bytesRead == 0) {
 			writtenChunks = writtenChunks + 1
-			fileId, urlLocation, assignErr := fs.assignNewFileInfo(w, r, replication, collection, dataCenter)
+			fileId, urlLocation, auth, assignErr := fs.assignNewFileInfo(w, r, replication, collection, dataCenter)
 			if assignErr != nil {
 				return nil, assignErr
 			}
 
 			// upload the chunk to the volume server
 			chunkName := fileName + "_chunk_" + strconv.FormatInt(int64(len(fileChunks)+1), 10)
-			uploadErr := fs.doUpload(urlLocation, w, r, chunkBuf[0:chunkBufOffset], chunkName, "application/octet-stream", fileId)
+			uploadErr := fs.doUpload(urlLocation, w, r, chunkBuf[0:chunkBufOffset], chunkName, "application/octet-stream", fileId, auth)
 			if uploadErr != nil {
 				return nil, uploadErr
 			}
@@ -175,11 +176,11 @@ func (fs *FilerServer) doAutoChunk(w http.ResponseWriter, r *http.Request, conte
 	return
 }
 
-func (fs *FilerServer) doUpload(urlLocation string, w http.ResponseWriter, r *http.Request, chunkBuf []byte, fileName string, contentType string, fileId string) (err error) {
+func (fs *FilerServer) doUpload(urlLocation string, w http.ResponseWriter, r *http.Request, chunkBuf []byte, fileName string, contentType string, fileId string, auth security.EncodedJwt) (err error) {
 	err = nil
 
 	ioReader := ioutil.NopCloser(bytes.NewBuffer(chunkBuf))
-	uploadResult, uploadError := operation.Upload(urlLocation, fileName, ioReader, false, contentType, nil, fs.jwt(fileId))
+	uploadResult, uploadError := operation.Upload(urlLocation, fileName, ioReader, false, contentType, nil, auth)
 	if uploadResult != nil {
 		glog.V(0).Infoln("Chunk upload result. Name:", uploadResult.Name, "Fid:", fileId, "Size:", uploadResult.Size)
 	}
diff --git a/weed/server/master_grpc_server.go b/weed/server/master_grpc_server.go
index 93dce59d8..043a6ff51 100644
--- a/weed/server/master_grpc_server.go
+++ b/weed/server/master_grpc_server.go
@@ -67,7 +67,6 @@ func (ms *MasterServer) SendHeartbeat(stream master_pb.Seaweed_SendHeartbeatServ
 			glog.V(0).Infof("added volume server %v:%d", heartbeat.GetIp(), heartbeat.GetPort())
 			if err := stream.Send(&master_pb.HeartbeatResponse{
 				VolumeSizeLimit: uint64(ms.volumeSizeLimitMB) * 1024 * 1024,
-				SecretKey:       string(ms.guard.SecretKey),
 			}); err != nil {
 				return err
 			}
diff --git a/weed/server/master_grpc_server_volume.go b/weed/server/master_grpc_server_volume.go
index ae0819d2d..13f8b37d1 100644
--- a/weed/server/master_grpc_server_volume.go
+++ b/weed/server/master_grpc_server_volume.go
@@ -6,6 +6,7 @@ import (
 
 	"github.com/chrislusf/raft"
 	"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
+	"github.com/chrislusf/seaweedfs/weed/security"
 	"github.com/chrislusf/seaweedfs/weed/storage"
 	"github.com/chrislusf/seaweedfs/weed/topology"
 )
@@ -75,7 +76,7 @@ func (ms *MasterServer) Assign(ctx context.Context, req *master_pb.AssignRequest
 		}
 		ms.vgLock.Lock()
 		if !ms.Topo.HasWritableVolume(option) {
-			if _, err = ms.vg.AutomaticGrowByType(option, ms.Topo); err != nil {
+			if _, err = ms.vg.AutomaticGrowByType(option, ms.grpcDialOpiton, ms.Topo); err != nil {
 				ms.vgLock.Unlock()
 				return nil, fmt.Errorf("Cannot grow volume group! %v", err)
 			}
@@ -92,6 +93,7 @@ func (ms *MasterServer) Assign(ctx context.Context, req *master_pb.AssignRequest
 		Url:       dn.Url(),
 		PublicUrl: dn.PublicUrl,
 		Count:     count,
+		Auth:      string(security.GenJwt(ms.guard.SigningKey, fid)),
 	}, nil
 }
 
diff --git a/weed/server/master_server.go b/weed/server/master_server.go
index 492bb76e9..a44a567d6 100644
--- a/weed/server/master_server.go
+++ b/weed/server/master_server.go
@@ -2,6 +2,7 @@ package weed_server
 
 import (
 	"fmt"
+	"google.golang.org/grpc"
 	"net/http"
 	"net/http/httputil"
 	"net/url"
@@ -15,6 +16,7 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/topology"
 	"github.com/chrislusf/seaweedfs/weed/util"
 	"github.com/gorilla/mux"
+	"github.com/spf13/viper"
 )
 
 type MasterServer struct {
@@ -36,6 +38,8 @@ type MasterServer struct {
 	// notifying clients
 	clientChansLock sync.RWMutex
 	clientChans     map[string]chan *master_pb.VolumeLocation
+
+	grpcDialOpiton grpc.DialOption
 }
 
 func NewMasterServer(r *mux.Router, port int, metaFolder string,
@@ -45,9 +49,11 @@ func NewMasterServer(r *mux.Router, port int, metaFolder string,
 	defaultReplicaPlacement string,
 	garbageThreshold float64,
 	whiteList []string,
-	secureKey string,
 ) *MasterServer {
 
+	v := viper.GetViper()
+	signingKey := v.GetString("jwt.signing.key")
+
 	var preallocateSize int64
 	if preallocate {
 		preallocateSize = int64(volumeSizeLimitMB) * (1 << 20)
@@ -60,6 +66,7 @@ func NewMasterServer(r *mux.Router, port int, metaFolder string,
 		defaultReplicaPlacement: defaultReplicaPlacement,
 		garbageThreshold:        garbageThreshold,
 		clientChans:             make(map[string]chan *master_pb.VolumeLocation),
+		grpcDialOpiton:          security.LoadClientTLS(v.Sub("grpc"), "master"),
 	}
 	ms.bounedLeaderChan = make(chan int, 16)
 	seq := sequence.NewMemorySequencer()
@@ -67,7 +74,7 @@ func NewMasterServer(r *mux.Router, port int, metaFolder string,
 	ms.vg = topology.NewDefaultVolumeGrowth()
 	glog.V(0).Infoln("Volume Size Limit is", volumeSizeLimitMB, "MB")
 
-	ms.guard = security.NewGuard(whiteList, secureKey)
+	ms.guard = security.NewGuard(whiteList, signingKey)
 
 	handleStaticResources2(r)
 	r.HandleFunc("/", ms.uiStatusHandler)
@@ -85,7 +92,7 @@ func NewMasterServer(r *mux.Router, port int, metaFolder string,
 	r.HandleFunc("/stats/memory", ms.guard.WhiteList(statsMemoryHandler))
 	r.HandleFunc("/{fileId}", ms.proxyToLeader(ms.redirectHandler))
 
-	ms.Topo.StartRefreshWritableVolumes(garbageThreshold, ms.preallocate)
+	ms.Topo.StartRefreshWritableVolumes(ms.grpcDialOpiton, garbageThreshold, ms.preallocate)
 
 	return ms
 }
diff --git a/weed/server/master_server_handlers.go b/weed/server/master_server_handlers.go
index a797dddfc..5bdb448c1 100644
--- a/weed/server/master_server_handlers.go
+++ b/weed/server/master_server_handlers.go
@@ -7,6 +7,7 @@ import (
 	"strings"
 
 	"github.com/chrislusf/seaweedfs/weed/operation"
+	"github.com/chrislusf/seaweedfs/weed/security"
 	"github.com/chrislusf/seaweedfs/weed/stats"
 	"github.com/chrislusf/seaweedfs/weed/storage"
 )
@@ -40,12 +41,23 @@ func (ms *MasterServer) lookupVolumeId(vids []string, collection string) (volume
 	return
 }
 
-// Takes one volumeId only, can not do batch lookup
+// If "fileId" is provided, this returns the fileId location and a JWT to update or delete the file.
+// If "volumeId" is provided, this only returns the volumeId location
 func (ms *MasterServer) dirLookupHandler(w http.ResponseWriter, r *http.Request) {
 	vid := r.FormValue("volumeId")
-	commaSep := strings.Index(vid, ",")
-	if commaSep > 0 {
-		vid = vid[0:commaSep]
+	if vid != "" {
+		// backward compatible
+		commaSep := strings.Index(vid, ",")
+		if commaSep > 0 {
+			vid = vid[0:commaSep]
+		}
+	}
+	fileId := r.FormValue("fileId")
+	if fileId != "" {
+		commaSep := strings.Index(fileId, ",")
+		if commaSep > 0 {
+			vid = fileId[0:commaSep]
+		}
 	}
 	vids := []string{vid}
 	collection := r.FormValue("collection") //optional, but can be faster if too many collections
@@ -54,6 +66,8 @@ func (ms *MasterServer) dirLookupHandler(w http.ResponseWriter, r *http.Request)
 	httpStatus := http.StatusOK
 	if location.Error != "" {
 		httpStatus = http.StatusNotFound
+	} else {
+		ms.maybeAddJwtAuthorization(w, fileId)
 	}
 	writeJsonQuiet(w, r, httpStatus, location)
 }
@@ -79,7 +93,7 @@ func (ms *MasterServer) dirAssignHandler(w http.ResponseWriter, r *http.Request)
 		ms.vgLock.Lock()
 		defer ms.vgLock.Unlock()
 		if !ms.Topo.HasWritableVolume(option) {
-			if _, err = ms.vg.AutomaticGrowByType(option, ms.Topo); err != nil {
+			if _, err = ms.vg.AutomaticGrowByType(option, ms.grpcDialOpiton, ms.Topo); err != nil {
 				writeJsonError(w, r, http.StatusInternalServerError,
 					fmt.Errorf("Cannot grow volume group! %v", err))
 				return
@@ -88,8 +102,17 @@ func (ms *MasterServer) dirAssignHandler(w http.ResponseWriter, r *http.Request)
 	}
 	fid, count, dn, err := ms.Topo.PickForWrite(requestedCount, option)
 	if err == nil {
+		ms.maybeAddJwtAuthorization(w, fid)
 		writeJsonQuiet(w, r, http.StatusOK, operation.AssignResult{Fid: fid, Url: dn.Url(), PublicUrl: dn.PublicUrl, Count: count})
 	} else {
 		writeJsonQuiet(w, r, http.StatusNotAcceptable, operation.AssignResult{Error: err.Error()})
 	}
 }
+
+func (ms *MasterServer) maybeAddJwtAuthorization(w http.ResponseWriter, fileId string) {
+	encodedJwt := security.GenJwt(ms.guard.SigningKey, fileId)
+	if encodedJwt == "" {
+		return
+	}
+	w.Header().Set("Authorization", "BEARER "+string(encodedJwt))
+}
diff --git a/weed/server/master_server_handlers_admin.go b/weed/server/master_server_handlers_admin.go
index 3a2662908..eccf3ee4c 100644
--- a/weed/server/master_server_handlers_admin.go
+++ b/weed/server/master_server_handlers_admin.go
@@ -24,7 +24,7 @@ func (ms *MasterServer) collectionDeleteHandler(w http.ResponseWriter, r *http.R
 		return
 	}
 	for _, server := range collection.ListVolumeServers() {
-		err := operation.WithVolumeServerClient(server.Url(), func(client volume_server_pb.VolumeServerClient) error {
+		err := operation.WithVolumeServerClient(server.Url(), ms.grpcDialOpiton, func(client volume_server_pb.VolumeServerClient) error {
 			ctx, cancel := context.WithTimeout(context.Background(), time.Duration(5*time.Second))
 			defer cancel()
 
@@ -60,7 +60,7 @@ func (ms *MasterServer) volumeVacuumHandler(w http.ResponseWriter, r *http.Reque
 		}
 	}
 	glog.Infoln("garbageThreshold =", gcThreshold)
-	ms.Topo.Vacuum(gcThreshold, ms.preallocate)
+	ms.Topo.Vacuum(ms.grpcDialOpiton, gcThreshold, ms.preallocate)
 	ms.dirStatusHandler(w, r)
 }
 
@@ -76,7 +76,7 @@ func (ms *MasterServer) volumeGrowHandler(w http.ResponseWriter, r *http.Request
 			if ms.Topo.FreeSpace() < count*option.ReplicaPlacement.GetCopyCount() {
 				err = errors.New("Only " + strconv.Itoa(ms.Topo.FreeSpace()) + " volumes left! Not enough for " + strconv.Itoa(count*option.ReplicaPlacement.GetCopyCount()))
 			} else {
-				count, err = ms.vg.GrowByCountAndType(count, option, ms.Topo)
+				count, err = ms.vg.GrowByCountAndType(ms.grpcDialOpiton, count, option, ms.Topo)
 			}
 		} else {
 			err = errors.New("parameter count is not found")
@@ -126,13 +126,13 @@ func (ms *MasterServer) selfUrl(r *http.Request) string {
 }
 func (ms *MasterServer) submitFromMasterServerHandler(w http.ResponseWriter, r *http.Request) {
 	if ms.Topo.IsLeader() {
-		submitForClientHandler(w, r, ms.selfUrl(r))
+		submitForClientHandler(w, r, ms.selfUrl(r), ms.grpcDialOpiton)
 	} else {
 		masterUrl, err := ms.Topo.Leader()
 		if err != nil {
 			writeJsonError(w, r, http.StatusInternalServerError, err)
 		} else {
-			submitForClientHandler(w, r, masterUrl)
+			submitForClientHandler(w, r, masterUrl, ms.grpcDialOpiton)
 		}
 	}
 }
diff --git a/weed/server/raft_server.go b/weed/server/raft_server.go
index c332da38e..7afef0b15 100644
--- a/weed/server/raft_server.go
+++ b/weed/server/raft_server.go
@@ -131,7 +131,7 @@ func isPeersChanged(dir string, self string, peers []string) (oldPeers []string,
 
 func isTheFirstOne(self string, peers []string) bool {
 	sort.Strings(peers)
-	if len(peers)<=0{
+	if len(peers) <= 0 {
 		return true
 	}
 	return self == peers[0]
diff --git a/weed/server/volume_grpc_client_to_master.go b/weed/server/volume_grpc_client_to_master.go
index bd3ffd7b3..38603e4b6 100644
--- a/weed/server/volume_grpc_client_to_master.go
+++ b/weed/server/volume_grpc_client_to_master.go
@@ -2,11 +2,13 @@ package weed_server
 
 import (
 	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/security"
+	"github.com/spf13/viper"
+	"google.golang.org/grpc"
 	"time"
 
 	"github.com/chrislusf/seaweedfs/weed/glog"
 	"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
-	"github.com/chrislusf/seaweedfs/weed/security"
 	"github.com/chrislusf/seaweedfs/weed/util"
 	"golang.org/x/net/context"
 )
@@ -20,6 +22,8 @@ func (vs *VolumeServer) heartbeat() {
 	vs.store.SetDataCenter(vs.dataCenter)
 	vs.store.SetRack(vs.rack)
 
+	grpcDialOption := security.LoadClientTLS(viper.Sub("grpc"), "volume")
+
 	var err error
 	var newLeader string
 	for {
@@ -32,7 +36,7 @@ func (vs *VolumeServer) heartbeat() {
 				glog.V(0).Infof("failed to parse master grpc %v", masterGrpcAddress)
 				continue
 			}
-			newLeader, err = vs.doHeartbeat(master, masterGrpcAddress, time.Duration(vs.pulseSeconds)*time.Second)
+			newLeader, err = vs.doHeartbeat(master, masterGrpcAddress, grpcDialOption, time.Duration(vs.pulseSeconds)*time.Second)
 			if err != nil {
 				glog.V(0).Infof("heartbeat error: %v", err)
 				time.Sleep(time.Duration(vs.pulseSeconds) * time.Second)
@@ -41,9 +45,9 @@ func (vs *VolumeServer) heartbeat() {
 	}
 }
 
-func (vs *VolumeServer) doHeartbeat(masterNode, masterGrpcAddress string, sleepInterval time.Duration) (newLeader string, err error) {
+func (vs *VolumeServer) doHeartbeat(masterNode, masterGrpcAddress string, grpcDialOption grpc.DialOption, sleepInterval time.Duration) (newLeader string, err error) {
 
-	grpcConection, err := util.GrpcDial(masterGrpcAddress)
+	grpcConection, err := util.GrpcDial(masterGrpcAddress, grpcDialOption)
 	if err != nil {
 		return "", fmt.Errorf("fail to dial %s : %v", masterNode, err)
 	}
@@ -73,9 +77,6 @@ func (vs *VolumeServer) doHeartbeat(masterNode, masterGrpcAddress string, sleepI
 			if in.GetVolumeSizeLimit() != 0 {
 				vs.store.VolumeSizeLimit = in.GetVolumeSizeLimit()
 			}
-			if in.GetSecretKey() != "" {
-				vs.guard.SecretKey = security.Secret(in.GetSecretKey())
-			}
 			if in.GetLeader() != "" && masterNode != in.GetLeader() {
 				glog.V(0).Infof("Volume Server found a new master newLeader: %v instead of %v", in.GetLeader(), masterNode)
 				newLeader = in.GetLeader()
diff --git a/weed/server/volume_server.go b/weed/server/volume_server.go
index 0914e81b0..8e77ec570 100644
--- a/weed/server/volume_server.go
+++ b/weed/server/volume_server.go
@@ -1,21 +1,24 @@
 package weed_server
 
 import (
+	"google.golang.org/grpc"
 	"net/http"
 
 	"github.com/chrislusf/seaweedfs/weed/glog"
 	"github.com/chrislusf/seaweedfs/weed/security"
 	"github.com/chrislusf/seaweedfs/weed/storage"
+	"github.com/spf13/viper"
 )
 
 type VolumeServer struct {
-	MasterNodes   []string
-	currentMaster string
-	pulseSeconds  int
-	dataCenter    string
-	rack          string
-	store         *storage.Store
-	guard         *security.Guard
+	MasterNodes    []string
+	currentMaster  string
+	pulseSeconds   int
+	dataCenter     string
+	rack           string
+	store          *storage.Store
+	guard          *security.Guard
+	grpcDialOption grpc.DialOption
 
 	needleMapKind     storage.NeedleMapType
 	FixJpgOrientation bool
@@ -31,6 +34,11 @@ func NewVolumeServer(adminMux, publicMux *http.ServeMux, ip string,
 	whiteList []string,
 	fixJpgOrientation bool,
 	readRedirect bool) *VolumeServer {
+
+	v := viper.GetViper()
+	signingKey := v.GetString("jwt.signing.key")
+	enableUiAccess := v.GetBool("access.ui")
+
 	vs := &VolumeServer{
 		pulseSeconds:      pulseSeconds,
 		dataCenter:        dataCenter,
@@ -38,18 +46,22 @@ func NewVolumeServer(adminMux, publicMux *http.ServeMux, ip string,
 		needleMapKind:     needleMapKind,
 		FixJpgOrientation: fixJpgOrientation,
 		ReadRedirect:      readRedirect,
+		grpcDialOption:    security.LoadClientTLS(viper.Sub("grpc"), "volume"),
 	}
 	vs.MasterNodes = masterNodes
 	vs.store = storage.NewStore(port, ip, publicUrl, folders, maxCounts, vs.needleMapKind)
 
-	vs.guard = security.NewGuard(whiteList, "")
+	vs.guard = security.NewGuard(whiteList, signingKey)
 
 	handleStaticResources(adminMux)
-	adminMux.HandleFunc("/ui/index.html", vs.uiStatusHandler)
-	adminMux.HandleFunc("/status", vs.guard.WhiteList(vs.statusHandler))
-	adminMux.HandleFunc("/stats/counter", vs.guard.WhiteList(statsCounterHandler))
-	adminMux.HandleFunc("/stats/memory", vs.guard.WhiteList(statsMemoryHandler))
-	adminMux.HandleFunc("/stats/disk", vs.guard.WhiteList(vs.statsDiskHandler))
+	if signingKey == "" || enableUiAccess {
+		// only expose the volume server details for safe environments
+		adminMux.HandleFunc("/ui/index.html", vs.uiStatusHandler)
+		adminMux.HandleFunc("/status", vs.guard.WhiteList(vs.statusHandler))
+		adminMux.HandleFunc("/stats/counter", vs.guard.WhiteList(statsCounterHandler))
+		adminMux.HandleFunc("/stats/memory", vs.guard.WhiteList(statsMemoryHandler))
+		adminMux.HandleFunc("/stats/disk", vs.guard.WhiteList(vs.statsDiskHandler))
+	}
 	adminMux.HandleFunc("/", vs.privateStoreHandler)
 	if publicMux != adminMux {
 		// separated admin and public port
@@ -69,5 +81,5 @@ func (vs *VolumeServer) Shutdown() {
 }
 
 func (vs *VolumeServer) jwt(fileId string) security.EncodedJwt {
-	return security.GenJwt(vs.guard.SecretKey, fileId)
+	return security.GenJwt(vs.guard.SigningKey, fileId)
 }
diff --git a/weed/server/volume_server_handlers.go b/weed/server/volume_server_handlers.go
index 77b1274fd..0e9aaeb3b 100644
--- a/weed/server/volume_server_handlers.go
+++ b/weed/server/volume_server_handlers.go
@@ -3,6 +3,8 @@ package weed_server
 import (
 	"net/http"
 
+	"github.com/chrislusf/seaweedfs/weed/glog"
+	"github.com/chrislusf/seaweedfs/weed/security"
 	"github.com/chrislusf/seaweedfs/weed/stats"
 )
 
@@ -45,3 +47,32 @@ func (vs *VolumeServer) publicReadOnlyHandler(w http.ResponseWriter, r *http.Req
 		vs.GetOrHeadHandler(w, r)
 	}
 }
+
+func (vs *VolumeServer) maybeCheckJwtAuthorization(r *http.Request, vid, fid string) bool {
+
+	if len(vs.guard.SigningKey) == 0 {
+		return true
+	}
+
+	tokenStr := security.GetJwt(r)
+	if tokenStr == "" {
+		glog.V(1).Infof("missing jwt from %s", r.RemoteAddr)
+		return false
+	}
+
+	token, err := security.DecodeJwt(vs.guard.SigningKey, tokenStr)
+	if err != nil {
+		glog.V(1).Infof("jwt verification error from %s: %v", r.RemoteAddr, err)
+		return false
+	}
+	if !token.Valid {
+		glog.V(1).Infof("jwt invalid from %s: %v", r.RemoteAddr, tokenStr)
+		return false
+	}
+
+	if sc, ok := token.Claims.(*security.SeaweedFileIdClaims); ok {
+		return sc.Fid == vid+","+fid
+	}
+	glog.V(1).Infof("unexpected jwt from %s: %v", r.RemoteAddr, tokenStr)
+	return false
+}
diff --git a/weed/server/volume_server_handlers_write.go b/weed/server/volume_server_handlers_write.go
index fd93142e1..6b78cea40 100644
--- a/weed/server/volume_server_handlers_write.go
+++ b/weed/server/volume_server_handlers_write.go
@@ -20,13 +20,20 @@ func (vs *VolumeServer) PostHandler(w http.ResponseWriter, r *http.Request) {
 		writeJsonError(w, r, http.StatusBadRequest, e)
 		return
 	}
-	vid, _, _, _, _ := parseURLPath(r.URL.Path)
+
+	vid, fid, _, _, _ := parseURLPath(r.URL.Path)
 	volumeId, ve := storage.NewVolumeId(vid)
 	if ve != nil {
 		glog.V(0).Infoln("NewVolumeId error:", ve)
 		writeJsonError(w, r, http.StatusBadRequest, ve)
 		return
 	}
+
+	if !vs.maybeCheckJwtAuthorization(r, vid, fid) {
+		writeJsonError(w, r, http.StatusUnauthorized, errors.New("wrong jwt"))
+		return
+	}
+
 	needle, originalSize, ne := storage.CreateNeedleFromRequest(r, vs.FixJpgOrientation)
 	if ne != nil {
 		writeJsonError(w, r, http.StatusBadRequest, ne)
@@ -56,6 +63,11 @@ func (vs *VolumeServer) DeleteHandler(w http.ResponseWriter, r *http.Request) {
 	volumeId, _ := storage.NewVolumeId(vid)
 	n.ParsePath(fid)
 
+	if !vs.maybeCheckJwtAuthorization(r, vid, fid) {
+		writeJsonError(w, r, http.StatusUnauthorized, errors.New("wrong jwt"))
+		return
+	}
+
 	// glog.V(2).Infof("volume %s deleting %s", vid, n)
 
 	cookie := n.Cookie
@@ -83,7 +95,7 @@ func (vs *VolumeServer) DeleteHandler(w http.ResponseWriter, r *http.Request) {
 			return
 		}
 		// make sure all chunks had deleted before delete manifest
-		if e := chunkManifest.DeleteChunks(vs.GetMaster()); e != nil {
+		if e := chunkManifest.DeleteChunks(vs.GetMaster(), vs.grpcDialOption); e != nil {
 			writeJsonError(w, r, http.StatusInternalServerError, fmt.Errorf("Delete chunks error: %v", e))
 			return
 		}
diff --git a/weed/storage/volume_sync.go b/weed/storage/volume_sync.go
index 137a9b4ca..8d90a729d 100644
--- a/weed/storage/volume_sync.go
+++ b/weed/storage/volume_sync.go
@@ -3,6 +3,7 @@ package storage
 import (
 	"context"
 	"fmt"
+	"google.golang.org/grpc"
 	"io"
 	"os"
 	"sort"
@@ -45,12 +46,12 @@ optimized more later).
 
 */
 
-func (v *Volume) Synchronize(volumeServer string) (err error) {
+func (v *Volume) Synchronize(volumeServer string, grpcDialOption grpc.DialOption) (err error) {
 	var lastCompactRevision uint16 = 0
 	var compactRevision uint16 = 0
 	var masterMap *needle.CompactMap
 	for i := 0; i < 3; i++ {
-		if masterMap, _, compactRevision, err = fetchVolumeFileEntries(volumeServer, v.Id); err != nil {
+		if masterMap, _, compactRevision, err = fetchVolumeFileEntries(volumeServer, grpcDialOption, v.Id); err != nil {
 			return fmt.Errorf("Failed to sync volume %d entries with %s: %v", v.Id, volumeServer, err)
 		}
 		if lastCompactRevision != compactRevision && lastCompactRevision != 0 {
@@ -62,7 +63,7 @@ func (v *Volume) Synchronize(volumeServer string) (err error) {
 			}
 		}
 		lastCompactRevision = compactRevision
-		if err = v.trySynchronizing(volumeServer, masterMap, compactRevision); err == nil {
+		if err = v.trySynchronizing(volumeServer, grpcDialOption, masterMap, compactRevision); err == nil {
 			return
 		}
 	}
@@ -77,7 +78,7 @@ func (a ByOffset) Less(i, j int) bool { return a[i].Offset < a[j].Offset }
 
 // trySynchronizing sync with remote volume server incrementally by
 // make up the local and remote delta.
-func (v *Volume) trySynchronizing(volumeServer string, masterMap *needle.CompactMap, compactRevision uint16) error {
+func (v *Volume) trySynchronizing(volumeServer string, grpcDialOption grpc.DialOption, masterMap *needle.CompactMap, compactRevision uint16) error {
 	slaveIdxFile, err := os.Open(v.nm.IndexFileName())
 	if err != nil {
 		return fmt.Errorf("Open volume %d index file: %v", v.Id, err)
@@ -126,7 +127,7 @@ func (v *Volume) trySynchronizing(volumeServer string, masterMap *needle.Compact
 			continue
 		}
 		// add master file entry to local data file
-		if err := v.fetchNeedle(volumeServer, needleValue, compactRevision); err != nil {
+		if err := v.fetchNeedle(volumeServer, grpcDialOption, needleValue, compactRevision); err != nil {
 			glog.V(0).Infof("Fetch needle %v from %s: %v", needleValue, volumeServer, err)
 			return err
 		}
@@ -136,16 +137,16 @@ func (v *Volume) trySynchronizing(volumeServer string, masterMap *needle.Compact
 	return nil
 }
 
-func fetchVolumeFileEntries(volumeServer string, vid VolumeId) (m *needle.CompactMap, lastOffset uint64, compactRevision uint16, err error) {
+func fetchVolumeFileEntries(volumeServer string, grpcDialOption grpc.DialOption, vid VolumeId) (m *needle.CompactMap, lastOffset uint64, compactRevision uint16, err error) {
 	m = needle.NewCompactMap()
 
-	syncStatus, err := operation.GetVolumeSyncStatus(volumeServer, uint32(vid))
+	syncStatus, err := operation.GetVolumeSyncStatus(volumeServer, grpcDialOption, uint32(vid))
 	if err != nil {
 		return m, 0, 0, err
 	}
 
 	total := 0
-	err = operation.GetVolumeIdxEntries(volumeServer, uint32(vid), func(key NeedleId, offset Offset, size uint32) {
+	err = operation.GetVolumeIdxEntries(volumeServer, grpcDialOption, uint32(vid), func(key NeedleId, offset Offset, size uint32) {
 		// println("remote key", key, "offset", offset*NeedlePaddingSize, "size", size)
 		if offset > 0 && size != TombstoneFileSize {
 			m.Set(NeedleId(key), offset, size)
@@ -187,9 +188,9 @@ func (v *Volume) removeNeedle(key NeedleId) {
 // fetchNeedle fetches a remote volume needle by vid, id, offset
 // The compact revision is checked first in case the remote volume
 // is compacted and the offset is invalid any more.
-func (v *Volume) fetchNeedle(volumeServer string, needleValue needle.NeedleValue, compactRevision uint16) error {
+func (v *Volume) fetchNeedle(volumeServer string, grpcDialOption grpc.DialOption, needleValue needle.NeedleValue, compactRevision uint16) error {
 
-	return operation.WithVolumeServerClient(volumeServer, func(client volume_server_pb.VolumeServerClient) error {
+	return operation.WithVolumeServerClient(volumeServer, grpcDialOption, func(client volume_server_pb.VolumeServerClient) error {
 		stream, err := client.VolumeSyncData(context.Background(), &volume_server_pb.VolumeSyncDataRequest{
 			VolumdId: uint32(v.Id),
 			Revision: uint32(compactRevision),
diff --git a/weed/topology/allocate_volume.go b/weed/topology/allocate_volume.go
index 55796ab43..ff0bbce42 100644
--- a/weed/topology/allocate_volume.go
+++ b/weed/topology/allocate_volume.go
@@ -2,6 +2,7 @@ package topology
 
 import (
 	"context"
+	"google.golang.org/grpc"
 	"time"
 
 	"github.com/chrislusf/seaweedfs/weed/operation"
@@ -13,9 +14,9 @@ type AllocateVolumeResult struct {
 	Error string
 }
 
-func AllocateVolume(dn *DataNode, vid storage.VolumeId, option *VolumeGrowOption) error {
+func AllocateVolume(dn *DataNode, grpcDialOption grpc.DialOption, vid storage.VolumeId, option *VolumeGrowOption) error {
 
-	return operation.WithVolumeServerClient(dn.Url(), func(client volume_server_pb.VolumeServerClient) error {
+	return operation.WithVolumeServerClient(dn.Url(), grpcDialOption, func(client volume_server_pb.VolumeServerClient) error {
 		ctx, cancel := context.WithTimeout(context.Background(), time.Duration(5*time.Second))
 		defer cancel()
 
diff --git a/weed/topology/store_replicate.go b/weed/topology/store_replicate.go
index c73fb706a..3967bb3e3 100644
--- a/weed/topology/store_replicate.go
+++ b/weed/topology/store_replicate.go
@@ -102,7 +102,7 @@ func ReplicatedDelete(masterNode string, store *storage.Store,
 	if needToReplicate { //send to other replica locations
 		if r.FormValue("type") != "replicate" {
 			if err = distributedOperation(masterNode, store, volumeId, func(location operation.Location) error {
-				return util.Delete("http://"+location.Url+r.URL.Path+"?type=replicate", jwt)
+				return util.Delete("http://"+location.Url+r.URL.Path+"?type=replicate", string(jwt))
 			}); err != nil {
 				ret = 0
 			}
diff --git a/weed/topology/topology.go b/weed/topology/topology.go
index 3bf827d82..619cc9696 100644
--- a/weed/topology/topology.go
+++ b/weed/topology/topology.go
@@ -50,7 +50,7 @@ func NewTopology(id string, seq sequence.Sequencer, volumeSizeLimit uint64, puls
 }
 
 func (t *Topology) IsLeader() bool {
-	if t.RaftServer!=nil {
+	if t.RaftServer != nil {
 		return t.RaftServer.State() == raft.Leader
 	}
 	return false
diff --git a/weed/topology/topology_event_handling.go b/weed/topology/topology_event_handling.go
index a301103eb..041351492 100644
--- a/weed/topology/topology_event_handling.go
+++ b/weed/topology/topology_event_handling.go
@@ -1,6 +1,7 @@
 package topology
 
 import (
+	"google.golang.org/grpc"
 	"math/rand"
 	"time"
 
@@ -8,7 +9,7 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/storage"
 )
 
-func (t *Topology) StartRefreshWritableVolumes(garbageThreshold float64, preallocate int64) {
+func (t *Topology) StartRefreshWritableVolumes(grpcDialOption grpc.DialOption, garbageThreshold float64, preallocate int64) {
 	go func() {
 		for {
 			if t.IsLeader() {
@@ -22,7 +23,7 @@ func (t *Topology) StartRefreshWritableVolumes(garbageThreshold float64, preallo
 		c := time.Tick(15 * time.Minute)
 		for _ = range c {
 			if t.IsLeader() {
-				t.Vacuum(garbageThreshold, preallocate)
+				t.Vacuum(grpcDialOption, garbageThreshold, preallocate)
 			}
 		}
 	}(garbageThreshold)
diff --git a/weed/topology/topology_vacuum.go b/weed/topology/topology_vacuum.go
index 48a75ba9d..71d3ead76 100644
--- a/weed/topology/topology_vacuum.go
+++ b/weed/topology/topology_vacuum.go
@@ -2,6 +2,7 @@ package topology
 
 import (
 	"context"
+	"google.golang.org/grpc"
 	"time"
 
 	"github.com/chrislusf/seaweedfs/weed/glog"
@@ -10,11 +11,11 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/storage"
 )
 
-func batchVacuumVolumeCheck(vl *VolumeLayout, vid storage.VolumeId, locationlist *VolumeLocationList, garbageThreshold float64) bool {
+func batchVacuumVolumeCheck(grpcDialOption grpc.DialOption, vl *VolumeLayout, vid storage.VolumeId, locationlist *VolumeLocationList, garbageThreshold float64) bool {
 	ch := make(chan bool, locationlist.Length())
 	for index, dn := range locationlist.list {
 		go func(index int, url string, vid storage.VolumeId) {
-			err := operation.WithVolumeServerClient(url, func(volumeServerClient volume_server_pb.VolumeServerClient) error {
+			err := operation.WithVolumeServerClient(url, grpcDialOption, func(volumeServerClient volume_server_pb.VolumeServerClient) error {
 				ctx, cancel := context.WithTimeout(context.Background(), time.Duration(5*time.Second))
 				defer cancel()
 
@@ -46,13 +47,13 @@ func batchVacuumVolumeCheck(vl *VolumeLayout, vid storage.VolumeId, locationlist
 	}
 	return isCheckSuccess
 }
-func batchVacuumVolumeCompact(vl *VolumeLayout, vid storage.VolumeId, locationlist *VolumeLocationList, preallocate int64) bool {
+func batchVacuumVolumeCompact(grpcDialOption grpc.DialOption, vl *VolumeLayout, vid storage.VolumeId, locationlist *VolumeLocationList, preallocate int64) bool {
 	vl.removeFromWritable(vid)
 	ch := make(chan bool, locationlist.Length())
 	for index, dn := range locationlist.list {
 		go func(index int, url string, vid storage.VolumeId) {
 			glog.V(0).Infoln(index, "Start vacuuming", vid, "on", url)
-			err := operation.WithVolumeServerClient(url, func(volumeServerClient volume_server_pb.VolumeServerClient) error {
+			err := operation.WithVolumeServerClient(url, grpcDialOption, func(volumeServerClient volume_server_pb.VolumeServerClient) error {
 				_, err := volumeServerClient.VacuumVolumeCompact(context.Background(), &volume_server_pb.VacuumVolumeCompactRequest{
 					VolumdId: uint32(vid),
 				})
@@ -79,11 +80,11 @@ func batchVacuumVolumeCompact(vl *VolumeLayout, vid storage.VolumeId, locationli
 	}
 	return isVacuumSuccess
 }
-func batchVacuumVolumeCommit(vl *VolumeLayout, vid storage.VolumeId, locationlist *VolumeLocationList) bool {
+func batchVacuumVolumeCommit(grpcDialOption grpc.DialOption, vl *VolumeLayout, vid storage.VolumeId, locationlist *VolumeLocationList) bool {
 	isCommitSuccess := true
 	for _, dn := range locationlist.list {
 		glog.V(0).Infoln("Start Committing vacuum", vid, "on", dn.Url())
-		err := operation.WithVolumeServerClient(dn.Url(), func(volumeServerClient volume_server_pb.VolumeServerClient) error {
+		err := operation.WithVolumeServerClient(dn.Url(), grpcDialOption, func(volumeServerClient volume_server_pb.VolumeServerClient) error {
 			_, err := volumeServerClient.VacuumVolumeCommit(context.Background(), &volume_server_pb.VacuumVolumeCommitRequest{
 				VolumdId: uint32(vid),
 			})
@@ -101,10 +102,10 @@ func batchVacuumVolumeCommit(vl *VolumeLayout, vid storage.VolumeId, locationlis
 	}
 	return isCommitSuccess
 }
-func batchVacuumVolumeCleanup(vl *VolumeLayout, vid storage.VolumeId, locationlist *VolumeLocationList) {
+func batchVacuumVolumeCleanup(grpcDialOption grpc.DialOption, vl *VolumeLayout, vid storage.VolumeId, locationlist *VolumeLocationList) {
 	for _, dn := range locationlist.list {
 		glog.V(0).Infoln("Start cleaning up", vid, "on", dn.Url())
-		err := operation.WithVolumeServerClient(dn.Url(), func(volumeServerClient volume_server_pb.VolumeServerClient) error {
+		err := operation.WithVolumeServerClient(dn.Url(), grpcDialOption, func(volumeServerClient volume_server_pb.VolumeServerClient) error {
 			_, err := volumeServerClient.VacuumVolumeCleanup(context.Background(), &volume_server_pb.VacuumVolumeCleanupRequest{
 				VolumdId: uint32(vid),
 			})
@@ -118,21 +119,21 @@ func batchVacuumVolumeCleanup(vl *VolumeLayout, vid storage.VolumeId, locationli
 	}
 }
 
-func (t *Topology) Vacuum(garbageThreshold float64, preallocate int64) int {
+func (t *Topology) Vacuum(grpcDialOption grpc.DialOption, garbageThreshold float64, preallocate int64) int {
 	glog.V(1).Infof("Start vacuum on demand with threshold: %f", garbageThreshold)
 	for _, col := range t.collectionMap.Items() {
 		c := col.(*Collection)
 		for _, vl := range c.storageType2VolumeLayout.Items() {
 			if vl != nil {
 				volumeLayout := vl.(*VolumeLayout)
-				vacuumOneVolumeLayout(volumeLayout, c, garbageThreshold, preallocate)
+				vacuumOneVolumeLayout(grpcDialOption, volumeLayout, c, garbageThreshold, preallocate)
 			}
 		}
 	}
 	return 0
 }
 
-func vacuumOneVolumeLayout(volumeLayout *VolumeLayout, c *Collection, garbageThreshold float64, preallocate int64) {
+func vacuumOneVolumeLayout(grpcDialOption grpc.DialOption, volumeLayout *VolumeLayout, c *Collection, garbageThreshold float64, preallocate int64) {
 
 	volumeLayout.accessLock.RLock()
 	tmpMap := make(map[storage.VolumeId]*VolumeLocationList)
@@ -152,11 +153,11 @@ func vacuumOneVolumeLayout(volumeLayout *VolumeLayout, c *Collection, garbageThr
 		}
 
 		glog.V(2).Infof("check vacuum on collection:%s volume:%d", c.Name, vid)
-		if batchVacuumVolumeCheck(volumeLayout, vid, locationList, garbageThreshold) {
-			if batchVacuumVolumeCompact(volumeLayout, vid, locationList, preallocate) {
-				batchVacuumVolumeCommit(volumeLayout, vid, locationList)
+		if batchVacuumVolumeCheck(grpcDialOption, volumeLayout, vid, locationList, garbageThreshold) {
+			if batchVacuumVolumeCompact(grpcDialOption, volumeLayout, vid, locationList, preallocate) {
+				batchVacuumVolumeCommit(grpcDialOption, volumeLayout, vid, locationList)
 			} else {
-				batchVacuumVolumeCleanup(volumeLayout, vid, locationList)
+				batchVacuumVolumeCleanup(grpcDialOption, volumeLayout, vid, locationList)
 			}
 		}
 	}
diff --git a/weed/topology/volume_growth.go b/weed/topology/volume_growth.go
index 9bf013ca6..3d178b827 100644
--- a/weed/topology/volume_growth.go
+++ b/weed/topology/volume_growth.go
@@ -2,6 +2,7 @@ package topology
 
 import (
 	"fmt"
+	"google.golang.org/grpc"
 	"math/rand"
 	"sync"
 
@@ -55,19 +56,19 @@ func (vg *VolumeGrowth) findVolumeCount(copyCount int) (count int) {
 	return
 }
 
-func (vg *VolumeGrowth) AutomaticGrowByType(option *VolumeGrowOption, topo *Topology) (count int, err error) {
-	count, err = vg.GrowByCountAndType(vg.findVolumeCount(option.ReplicaPlacement.GetCopyCount()), option, topo)
+func (vg *VolumeGrowth) AutomaticGrowByType(option *VolumeGrowOption, grpcDialOption grpc.DialOption, topo *Topology) (count int, err error) {
+	count, err = vg.GrowByCountAndType(grpcDialOption, vg.findVolumeCount(option.ReplicaPlacement.GetCopyCount()), option, topo)
 	if count > 0 && count%option.ReplicaPlacement.GetCopyCount() == 0 {
 		return count, nil
 	}
 	return count, err
 }
-func (vg *VolumeGrowth) GrowByCountAndType(targetCount int, option *VolumeGrowOption, topo *Topology) (counter int, err error) {
+func (vg *VolumeGrowth) GrowByCountAndType(grpcDialOption grpc.DialOption, targetCount int, option *VolumeGrowOption, topo *Topology) (counter int, err error) {
 	vg.accessLock.Lock()
 	defer vg.accessLock.Unlock()
 
 	for i := 0; i < targetCount; i++ {
-		if c, e := vg.findAndGrow(topo, option); e == nil {
+		if c, e := vg.findAndGrow(grpcDialOption, topo, option); e == nil {
 			counter += c
 		} else {
 			return counter, e
@@ -76,13 +77,13 @@ func (vg *VolumeGrowth) GrowByCountAndType(targetCount int, option *VolumeGrowOp
 	return
 }
 
-func (vg *VolumeGrowth) findAndGrow(topo *Topology, option *VolumeGrowOption) (int, error) {
+func (vg *VolumeGrowth) findAndGrow(grpcDialOption grpc.DialOption, topo *Topology, option *VolumeGrowOption) (int, error) {
 	servers, e := vg.findEmptySlotsForOneVolume(topo, option)
 	if e != nil {
 		return 0, e
 	}
 	vid := topo.NextVolumeId()
-	err := vg.grow(topo, vid, option, servers...)
+	err := vg.grow(grpcDialOption, topo, vid, option, servers...)
 	return len(servers), err
 }
 
@@ -189,9 +190,9 @@ func (vg *VolumeGrowth) findEmptySlotsForOneVolume(topo *Topology, option *Volum
 	return
 }
 
-func (vg *VolumeGrowth) grow(topo *Topology, vid storage.VolumeId, option *VolumeGrowOption, servers ...*DataNode) error {
+func (vg *VolumeGrowth) grow(grpcDialOption grpc.DialOption, topo *Topology, vid storage.VolumeId, option *VolumeGrowOption, servers ...*DataNode) error {
 	for _, server := range servers {
-		if err := AllocateVolume(server, vid, option); err == nil {
+		if err := AllocateVolume(server, grpcDialOption, vid, option); err == nil {
 			vi := storage.VolumeInfo{
 				Id:               vid,
 				Size:             0,
diff --git a/weed/util/grpc_client_server.go b/weed/util/grpc_client_server.go
index d029d21ae..b26366ae0 100644
--- a/weed/util/grpc_client_server.go
+++ b/weed/util/grpc_client_server.go
@@ -17,25 +17,38 @@ var (
 	grpcClientsLock sync.Mutex
 )
 
-func NewGrpcServer() *grpc.Server {
-	return grpc.NewServer(grpc.KeepaliveParams(keepalive.ServerParameters{
+func NewGrpcServer(opts ...grpc.ServerOption) *grpc.Server {
+	var options []grpc.ServerOption
+	options = append(options, grpc.KeepaliveParams(keepalive.ServerParameters{
 		Time:    10 * time.Second, // wait time before ping if no activity
 		Timeout: 20 * time.Second, // ping timeout
 	}), grpc.KeepaliveEnforcementPolicy(keepalive.EnforcementPolicy{
 		MinTime: 60 * time.Second, // min time a client should wait before sending a ping
 	}))
+	for _, opt := range opts {
+		if opt != nil {
+			options = append(options, opt)
+		}
+	}
+	return grpc.NewServer(options...)
 }
 
 func GrpcDial(address string, opts ...grpc.DialOption) (*grpc.ClientConn, error) {
 	// opts = append(opts, grpc.WithBlock())
 	// opts = append(opts, grpc.WithTimeout(time.Duration(5*time.Second)))
-	opts = append(opts, grpc.WithInsecure())
-	opts = append(opts, grpc.WithKeepaliveParams(keepalive.ClientParameters{
-		Time:    30 * time.Second, // client ping server if no activity for this long
-		Timeout: 20 * time.Second,
-	}))
-
-	return grpc.Dial(address, opts...)
+	var options []grpc.DialOption
+	options = append(options,
+		// grpc.WithInsecure(),
+		grpc.WithKeepaliveParams(keepalive.ClientParameters{
+			Time:    30 * time.Second, // client ping server if no activity for this long
+			Timeout: 20 * time.Second,
+		}))
+	for _, opt := range opts {
+		if opt != nil {
+			options = append(options, opt)
+		}
+	}
+	return grpc.Dial(address, options...)
 }
 
 func WithCachedGrpcClient(fn func(*grpc.ClientConn) error, address string, opts ...grpc.DialOption) error {
diff --git a/weed/util/http_util.go b/weed/util/http_util.go
index 21e0a678d..a465a7b7f 100644
--- a/weed/util/http_util.go
+++ b/weed/util/http_util.go
@@ -12,8 +12,6 @@ import (
 	"net/url"
 	"strings"
 	"time"
-
-	"github.com/chrislusf/seaweedfs/weed/security"
 )
 
 var (
@@ -97,7 +95,7 @@ func Head(url string) (http.Header, error) {
 	return r.Header, nil
 }
 
-func Delete(url string, jwt security.EncodedJwt) error {
+func Delete(url string, jwt string) error {
 	req, err := http.NewRequest("DELETE", url, nil)
 	if jwt != "" {
 		req.Header.Set("Authorization", "BEARER "+string(jwt))
diff --git a/weed/wdclient/masterclient.go b/weed/wdclient/masterclient.go
index b26853945..3600fe7c7 100644
--- a/weed/wdclient/masterclient.go
+++ b/weed/wdclient/masterclient.go
@@ -3,29 +3,32 @@ package wdclient
 import (
 	"context"
 	"fmt"
+	"math/rand"
 	"time"
 
 	"github.com/chrislusf/seaweedfs/weed/glog"
 	"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
 	"github.com/chrislusf/seaweedfs/weed/util"
-	"math/rand"
+	"google.golang.org/grpc"
 )
 
 type MasterClient struct {
-	ctx           context.Context
-	name          string
-	currentMaster string
-	masters       []string
+	ctx            context.Context
+	name           string
+	currentMaster  string
+	masters        []string
+	grpcDialOption grpc.DialOption
 
 	vidMap
 }
 
-func NewMasterClient(ctx context.Context, clientName string, masters []string) *MasterClient {
+func NewMasterClient(ctx context.Context, grpcDialOption grpc.DialOption, clientName string, masters []string) *MasterClient {
 	return &MasterClient{
-		ctx:     ctx,
-		name:    clientName,
-		masters: masters,
-		vidMap:  newVidMap(),
+		ctx:            ctx,
+		name:           clientName,
+		masters:        masters,
+		grpcDialOption: grpcDialOption,
+		vidMap:         newVidMap(),
 	}
 }
 
@@ -50,7 +53,7 @@ func (mc *MasterClient) KeepConnectedToMaster() {
 func (mc *MasterClient) tryAllMasters() {
 	for _, master := range mc.masters {
 		glog.V(0).Infof("Connecting to master %v", master)
-		gprcErr := withMasterClient(master, func(client master_pb.SeaweedClient) error {
+		gprcErr := withMasterClient(master, mc.grpcDialOption, func(client master_pb.SeaweedClient) error {
 
 			stream, err := client.KeepConnected(context.Background())
 			if err != nil {
@@ -96,14 +99,14 @@ func (mc *MasterClient) tryAllMasters() {
 	}
 }
 
-func withMasterClient(master string, fn func(client master_pb.SeaweedClient) error) error {
+func withMasterClient(master string, grpcDialOption grpc.DialOption, fn func(client master_pb.SeaweedClient) error) error {
 
 	masterGrpcAddress, parseErr := util.ParseServerToGrpcAddress(master, 0)
 	if parseErr != nil {
 		return fmt.Errorf("failed to parse master grpc %v", master)
 	}
 
-	grpcConnection, err := util.GrpcDial(masterGrpcAddress)
+	grpcConnection, err := util.GrpcDial(masterGrpcAddress, grpcDialOption)
 	if err != nil {
 		return fmt.Errorf("fail to dial %s: %v", master, err)
 	}
diff --git a/weed/wdclient/wdclient.go b/weed/wdclient/wdclient.go
deleted file mode 100644
index 722f4d061..000000000
--- a/weed/wdclient/wdclient.go
+++ /dev/null
@@ -1,15 +0,0 @@
-package wdclient
-
-import (
-	"context"
-)
-
-type SeaweedClient struct {
-	*MasterClient
-}
-
-func NewSeaweedClient(ctx context.Context, clientName string, masters []string) *SeaweedClient {
-	return &SeaweedClient{
-		MasterClient: NewMasterClient(ctx, clientName, masters),
-	}
-}