diff --git a/other/java/client/src/main/proto/filer.proto b/other/java/client/src/main/proto/filer.proto
index 9ee552561..5983c84d8 100644
--- a/other/java/client/src/main/proto/filer.proto
+++ b/other/java/client/src/main/proto/filer.proto
@@ -99,6 +99,7 @@ message FileChunk {
     string source_file_id = 6; // to be deprecated
     FileId fid = 7;
     FileId source_fid = 8;
+    bytes cipher_key = 9;
 }
 
 message FileId {
@@ -229,4 +230,5 @@ message GetFilerConfigurationResponse {
     uint32 max_mb = 4;
     string dir_buckets = 5;
     string dir_queues = 6;
+    bool cipher = 7;
 }
diff --git a/unmaintained/repeated_vacuum/repeated_vacuum.go b/unmaintained/repeated_vacuum/repeated_vacuum.go
index 718b6faa1..4a0464eda 100644
--- a/unmaintained/repeated_vacuum/repeated_vacuum.go
+++ b/unmaintained/repeated_vacuum/repeated_vacuum.go
@@ -35,7 +35,7 @@ func main() {
 
 		targetUrl := fmt.Sprintf("http://%s/%s", assignResult.Url, assignResult.Fid)
 
-		_, err = operation.Upload(targetUrl, fmt.Sprintf("test%d", i), reader, false, "", nil, assignResult.Auth)
+		_, err = operation.Upload(targetUrl, fmt.Sprintf("test%d", i), false, reader, false, "", nil, assignResult.Auth)
 		if err != nil {
 			log.Fatalf("upload: %v", err)
 		}
diff --git a/weed/command/filer.go b/weed/command/filer.go
index b5b595215..327ee8316 100644
--- a/weed/command/filer.go
+++ b/weed/command/filer.go
@@ -34,6 +34,7 @@ type FilerOptions struct {
 	dataCenter              *string
 	enableNotification      *bool
 	disableHttp             *bool
+	cipher                  *bool
 
 	// default leveldb directory, used in "weed server" mode
 	defaultLevelDbDirectory *string
@@ -53,6 +54,7 @@ func init() {
 	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")
 	f.disableHttp = cmdFiler.Flag.Bool("disableHttp", false, "disable http request, only gRpc operations are allowed")
+	f.cipher = cmdFiler.Flag.Bool("encryptVolumeData", false, "encrypt data on volume servers")
 }
 
 var cmdFiler = &Command{
@@ -111,6 +113,7 @@ func (fo *FilerOptions) startFiler() {
 		DefaultLevelDbDir:  defaultLevelDbDirectory,
 		DisableHttp:        *fo.disableHttp,
 		Port:               uint32(*fo.port),
+		Cipher:             *fo.cipher,
 	})
 	if nfs_err != nil {
 		glog.Fatalf("Filer startup error: %v", nfs_err)
diff --git a/weed/command/filer_copy.go b/weed/command/filer_copy.go
index 3e7ae1db2..8c01cfd74 100644
--- a/weed/command/filer_copy.go
+++ b/weed/command/filer_copy.go
@@ -41,6 +41,7 @@ type CopyOptions struct {
 	compressionLevel  *int
 	grpcDialOption    grpc.DialOption
 	masters           []string
+	cipher            bool
 }
 
 func init() {
@@ -108,7 +109,7 @@ func runCopy(cmd *Command, args []string) bool {
 	filerGrpcAddress := fmt.Sprintf("%s:%d", filerUrl.Hostname(), filerGrpcPort)
 	copy.grpcDialOption = security.LoadClientTLS(util.GetViper(), "grpc.client")
 
-	masters, collection, replication, maxMB, err := readFilerConfiguration(copy.grpcDialOption, filerGrpcAddress)
+	masters, collection, replication, maxMB, cipher, err := readFilerConfiguration(copy.grpcDialOption, filerGrpcAddress)
 	if err != nil {
 		fmt.Printf("read from filer %s: %v\n", filerGrpcAddress, err)
 		return false
@@ -123,6 +124,7 @@ func runCopy(cmd *Command, args []string) bool {
 		*copy.maxMB = int(maxMB)
 	}
 	copy.masters = masters
+	copy.cipher = cipher
 
 	if *cmdCopy.IsDebug {
 		util.SetupProfiling("filer.copy.cpu.pprof", "filer.copy.mem.pprof")
@@ -159,13 +161,14 @@ func runCopy(cmd *Command, args []string) bool {
 	return true
 }
 
-func readFilerConfiguration(grpcDialOption grpc.DialOption, filerGrpcAddress string) (masters []string, collection, replication string, maxMB uint32, err error) {
+func readFilerConfiguration(grpcDialOption grpc.DialOption, filerGrpcAddress string) (masters []string, collection, replication string, maxMB uint32, cipher bool, err error) {
 	err = pb.WithGrpcFilerClient(filerGrpcAddress, grpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
 		resp, err := client.GetFilerConfiguration(context.Background(), &filer_pb.GetFilerConfigurationRequest{})
 		if err != nil {
 			return fmt.Errorf("get filer %s configuration: %v", filerGrpcAddress, err)
 		}
 		masters, collection, replication, maxMB = resp.Masters, resp.Collection, resp.Replication, resp.MaxMb
+		cipher = resp.Cipher
 		return nil
 	})
 	return
@@ -300,7 +303,7 @@ func (worker *FileCopyWorker) uploadFileAsOne(task FileCopyTask, f *os.File) err
 
 		targetUrl := "http://" + assignResult.Url + "/" + assignResult.FileId
 
-		uploadResult, err := operation.UploadWithLocalCompressionLevel(targetUrl, fileName, f, false, mimeType, nil, security.EncodedJwt(assignResult.Auth), *worker.options.compressionLevel)
+		uploadResult, err := operation.UploadWithLocalCompressionLevel(targetUrl, fileName, worker.options.cipher, f, false, mimeType, nil, security.EncodedJwt(assignResult.Auth), *worker.options.compressionLevel)
 		if err != nil {
 			return fmt.Errorf("upload data %v to %s: %v\n", fileName, targetUrl, err)
 		}
@@ -310,11 +313,12 @@ func (worker *FileCopyWorker) uploadFileAsOne(task FileCopyTask, f *os.File) err
 		fmt.Printf("uploaded %s to %s\n", fileName, targetUrl)
 
 		chunks = append(chunks, &filer_pb.FileChunk{
-			FileId: assignResult.FileId,
-			Offset: 0,
-			Size:   uint64(uploadResult.Size),
-			Mtime:  time.Now().UnixNano(),
-			ETag:   uploadResult.ETag,
+			FileId:    assignResult.FileId,
+			Offset:    0,
+			Size:      uint64(uploadResult.Size),
+			Mtime:     time.Now().UnixNano(),
+			ETag:      uploadResult.ETag,
+			CipherKey: uploadResult.CipherKey,
 		})
 
 		fmt.Printf("copied %s => http://%s%s%s\n", fileName, worker.filerHost, task.destinationUrlPath, fileName)
@@ -409,10 +413,7 @@ func (worker *FileCopyWorker) uploadFileInChunks(task FileCopyTask, f *os.File,
 				replication = assignResult.Replication
 			}
 
-			uploadResult, err := operation.Upload(targetUrl,
-				fileName+"-"+strconv.FormatInt(i+1, 10),
-				io.NewSectionReader(f, i*chunkSize, chunkSize),
-				false, "", nil, security.EncodedJwt(assignResult.Auth))
+			uploadResult, err := operation.Upload(targetUrl, fileName+"-"+strconv.FormatInt(i+1, 10), false, io.NewSectionReader(f, i*chunkSize, chunkSize), false, "", nil, security.EncodedJwt(assignResult.Auth))
 			if err != nil {
 				uploadError = fmt.Errorf("upload data %v to %s: %v\n", fileName, targetUrl, err)
 				return
@@ -422,11 +423,12 @@ func (worker *FileCopyWorker) uploadFileInChunks(task FileCopyTask, f *os.File,
 				return
 			}
 			chunksChan <- &filer_pb.FileChunk{
-				FileId: assignResult.FileId,
-				Offset: i * chunkSize,
-				Size:   uint64(uploadResult.Size),
-				Mtime:  time.Now().UnixNano(),
-				ETag:   uploadResult.ETag,
+				FileId:    assignResult.FileId,
+				Offset:    i * chunkSize,
+				Size:      uint64(uploadResult.Size),
+				Mtime:     time.Now().UnixNano(),
+				ETag:      uploadResult.ETag,
+				CipherKey: uploadResult.CipherKey,
 			}
 			fmt.Printf("uploaded %s-%d to %s [%d,%d)\n", fileName, i+1, targetUrl, i*chunkSize, i*chunkSize+int64(uploadResult.Size))
 		}(i)
diff --git a/weed/command/mount_std.go b/weed/command/mount_std.go
index b195bf143..9177091a5 100644
--- a/weed/command/mount_std.go
+++ b/weed/command/mount_std.go
@@ -145,11 +145,13 @@ func RunMount(filer, filerMountRootPath, dir, collection, replication, dataCente
 
 	// try to connect to filer, filerBucketsPath may be useful later
 	grpcDialOption := security.LoadClientTLS(util.GetViper(), "grpc.client")
+	var cipher bool
 	err = pb.WithGrpcFilerClient(filerGrpcAddress, grpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
-		_, err := client.GetFilerConfiguration(context.Background(), &filer_pb.GetFilerConfigurationRequest{})
+		resp, err := client.GetFilerConfiguration(context.Background(), &filer_pb.GetFilerConfigurationRequest{})
 		if err != nil {
 			return fmt.Errorf("get filer %s configuration: %v", filerGrpcAddress, err)
 		}
+		cipher = resp.Cipher
 		return nil
 	})
 	if err != nil {
@@ -183,6 +185,7 @@ func RunMount(filer, filerMountRootPath, dir, collection, replication, dataCente
 		MountMtime:                  time.Now(),
 		Umask:                       umask,
 		OutsideContainerClusterMode: outsideContainerClusterMode,
+		Cipher:                      cipher,
 	}))
 	if err != nil {
 		fuse.Unmount(dir)
diff --git a/weed/command/scaffold.go b/weed/command/scaffold.go
index 5b246b7c0..f4a08fb51 100644
--- a/weed/command/scaffold.go
+++ b/weed/command/scaffold.go
@@ -75,9 +75,9 @@ const (
 # recursive_delete will delete all sub folders and files, similar to "rm -Rf"
 recursive_delete = false
 # directories under this folder will be automatically creating a separate bucket
-buckets_folder = /buckets
+buckets_folder = "/buckets"
 # directories under this folder will be store message queue data
-queues_folder = /queues
+queues_folder = "/queues"
 
 ####################################################
 # The following are filer store options
diff --git a/weed/command/server.go b/weed/command/server.go
index c9d27555c..f45429193 100644
--- a/weed/command/server.go
+++ b/weed/command/server.go
@@ -82,6 +82,7 @@ func init() {
 	filerOptions.disableDirListing = cmdServer.Flag.Bool("filer.disableDirListing", false, "turn off directory listing")
 	filerOptions.maxMB = cmdServer.Flag.Int("filer.maxMB", 32, "split files larger than the limit")
 	filerOptions.dirListingLimit = cmdServer.Flag.Int("filer.dirListLimit", 1000, "limit sub dir listing size")
+	filerOptions.cipher = cmdServer.Flag.Bool("filer.encryptVolumeData", false, "encrypt data on volume servers")
 
 	serverOptions.v.port = cmdServer.Flag.Int("volume.port", 8080, "volume server http listen port")
 	serverOptions.v.publicPort = cmdServer.Flag.Int("volume.port.public", 0, "volume server public port")
diff --git a/weed/command/webdav.go b/weed/command/webdav.go
index ba88a17be..4f5d5f5ce 100644
--- a/weed/command/webdav.go
+++ b/weed/command/webdav.go
@@ -1,6 +1,7 @@
 package command
 
 import (
+	"context"
 	"fmt"
 	"net/http"
 	"os/user"
@@ -9,6 +10,7 @@ import (
 
 	"github.com/chrislusf/seaweedfs/weed/glog"
 	"github.com/chrislusf/seaweedfs/weed/pb"
+	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
 	"github.com/chrislusf/seaweedfs/weed/security"
 	"github.com/chrislusf/seaweedfs/weed/server"
 	"github.com/chrislusf/seaweedfs/weed/util"
@@ -55,12 +57,6 @@ func runWebDav(cmd *Command, args []string) bool {
 
 func (wo *WebDavOption) startWebDav() bool {
 
-	filerGrpcAddress, err := pb.ParseFilerGrpcAddress(*wo.filer)
-	if err != nil {
-		glog.Fatal(err)
-		return false
-	}
-
 	// detect current user
 	uid, gid := uint32(0), uint32(0)
 	if u, err := user.Current(); err == nil {
@@ -72,13 +68,43 @@ func (wo *WebDavOption) startWebDav() bool {
 		}
 	}
 
+	// parse filer grpc address
+	filerGrpcAddress, err := pb.ParseFilerGrpcAddress(*wo.filer)
+	if err != nil {
+		glog.Fatal(err)
+		return false
+	}
+
+	grpcDialOption := security.LoadClientTLS(util.GetViper(), "grpc.client")
+
+	var cipher bool
+	// connect to filer
+	for {
+		err = pb.WithGrpcFilerClient(filerGrpcAddress, grpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
+			resp, err := client.GetFilerConfiguration(context.Background(), &filer_pb.GetFilerConfigurationRequest{})
+			if err != nil {
+				return fmt.Errorf("get filer %s configuration: %v", filerGrpcAddress, err)
+			}
+			cipher = resp.Cipher
+			return nil
+		})
+		if err != nil {
+			glog.V(0).Infof("wait to connect to filer %s grpc address %s", *wo.filer, filerGrpcAddress)
+			time.Sleep(time.Second)
+		} else {
+			glog.V(0).Infof("connected to filer %s grpc address %s", *wo.filer, filerGrpcAddress)
+			break
+		}
+	}
+
 	ws, webdavServer_err := weed_server.NewWebDavServer(&weed_server.WebDavOption{
 		Filer:            *wo.filer,
 		FilerGrpcAddress: filerGrpcAddress,
-		GrpcDialOption:   security.LoadClientTLS(util.GetViper(), "grpc.client"),
+		GrpcDialOption:   grpcDialOption,
 		Collection:       *wo.collection,
 		Uid:              uid,
 		Gid:              gid,
+		Cipher:           cipher,
 	})
 	if webdavServer_err != nil {
 		glog.Fatalf("WebDav Server startup error: %v", webdavServer_err)
diff --git a/weed/filer2/filechunks.go b/weed/filer2/filechunks.go
index b5876df82..98a965337 100644
--- a/weed/filer2/filechunks.go
+++ b/weed/filer2/filechunks.go
@@ -71,6 +71,7 @@ type ChunkView struct {
 	Size        uint64
 	LogicOffset int64
 	IsFullChunk bool
+	CipherKey   []byte
 }
 
 func ViewFromChunks(chunks []*filer_pb.FileChunk, offset int64, size int) (views []*ChunkView) {
@@ -94,6 +95,7 @@ func ViewFromVisibleIntervals(visibles []VisibleInterval, offset int64, size int
 				Size:        uint64(min(chunk.stop, stop) - offset),
 				LogicOffset: offset,
 				IsFullChunk: isFullChunk,
+				CipherKey:   chunk.cipherKey,
 			})
 			offset = min(chunk.stop, stop)
 		}
@@ -120,13 +122,7 @@ var bufPool = sync.Pool{
 
 func MergeIntoVisibles(visibles, newVisibles []VisibleInterval, chunk *filer_pb.FileChunk) []VisibleInterval {
 
-	newV := newVisibleInterval(
-		chunk.Offset,
-		chunk.Offset+int64(chunk.Size),
-		chunk.GetFileIdString(),
-		chunk.Mtime,
-		true,
-	)
+	newV := newVisibleInterval(chunk.Offset, chunk.Offset+int64(chunk.Size), chunk.GetFileIdString(), chunk.Mtime, true, chunk.CipherKey)
 
 	length := len(visibles)
 	if length == 0 {
@@ -140,23 +136,11 @@ func MergeIntoVisibles(visibles, newVisibles []VisibleInterval, chunk *filer_pb.
 	logPrintf("  before", visibles)
 	for _, v := range visibles {
 		if v.start < chunk.Offset && chunk.Offset < v.stop {
-			newVisibles = append(newVisibles, newVisibleInterval(
-				v.start,
-				chunk.Offset,
-				v.fileId,
-				v.modifiedTime,
-				false,
-			))
+			newVisibles = append(newVisibles, newVisibleInterval(v.start, chunk.Offset, v.fileId, v.modifiedTime, false, v.cipherKey))
 		}
 		chunkStop := chunk.Offset + int64(chunk.Size)
 		if v.start < chunkStop && chunkStop < v.stop {
-			newVisibles = append(newVisibles, newVisibleInterval(
-				chunkStop,
-				v.stop,
-				v.fileId,
-				v.modifiedTime,
-				false,
-			))
+			newVisibles = append(newVisibles, newVisibleInterval(chunkStop, v.stop, v.fileId, v.modifiedTime, false, v.cipherKey))
 		}
 		if chunkStop <= v.start || v.stop <= chunk.Offset {
 			newVisibles = append(newVisibles, v)
@@ -208,15 +192,17 @@ type VisibleInterval struct {
 	modifiedTime int64
 	fileId       string
 	isFullChunk  bool
+	cipherKey    []byte
 }
 
-func newVisibleInterval(start, stop int64, fileId string, modifiedTime int64, isFullChunk bool) VisibleInterval {
+func newVisibleInterval(start, stop int64, fileId string, modifiedTime int64, isFullChunk bool, cipherKey []byte) VisibleInterval {
 	return VisibleInterval{
 		start:        start,
 		stop:         stop,
 		fileId:       fileId,
 		modifiedTime: modifiedTime,
 		isFullChunk:  isFullChunk,
+		cipherKey:    cipherKey,
 	}
 }
 
diff --git a/weed/filer2/filer.go b/weed/filer2/filer.go
index bf43c3c52..cbb14a5c1 100644
--- a/weed/filer2/filer.go
+++ b/weed/filer2/filer.go
@@ -33,6 +33,7 @@ type Filer struct {
 	DirBucketsPath      string
 	DirQueuesPath       string
 	buckets             *FilerBuckets
+	Cipher              bool
 }
 
 func NewFiler(masters []string, grpcDialOption grpc.DialOption, filerGrpcPort uint32) *Filer {
diff --git a/weed/filer2/filer_client_util.go b/weed/filer2/filer_client_util.go
index ab9db2992..e80c4bf36 100644
--- a/weed/filer2/filer_client_util.go
+++ b/weed/filer2/filer_client_util.go
@@ -70,12 +70,7 @@ func ReadIntoBuffer(filerClient FilerClient, fullFilePath FullPath, buff []byte,
 
 			volumeServerAddress := filerClient.AdjustedUrl(locations.Locations[0].Url)
 			var n int64
-			n, err = util.ReadUrl(
-				fmt.Sprintf("http://%s/%s", volumeServerAddress, chunkView.FileId),
-				chunkView.Offset,
-				int(chunkView.Size),
-				buff[chunkView.LogicOffset-baseOffset:chunkView.LogicOffset-baseOffset+int64(chunkView.Size)],
-				!chunkView.IsFullChunk)
+			n, err = util.ReadUrl(fmt.Sprintf("http://%s/%s", volumeServerAddress, chunkView.FileId), chunkView.CipherKey, chunkView.IsFullChunk, chunkView.Offset, int(chunkView.Size), buff[chunkView.LogicOffset-baseOffset:chunkView.LogicOffset-baseOffset+int64(chunkView.Size)])
 
 			if err != nil {
 
diff --git a/weed/filer2/stream.go b/weed/filer2/stream.go
index 01b87cad1..0a1f943ea 100644
--- a/weed/filer2/stream.go
+++ b/weed/filer2/stream.go
@@ -27,7 +27,7 @@ func StreamContent(masterClient *wdclient.MasterClient, w io.Writer, chunks []*f
 
 	for _, chunkView := range chunkViews {
 		urlString := fileId2Url[chunkView.FileId]
-		_, err := util.ReadUrlAsStream(urlString, chunkView.Offset, int(chunkView.Size), func(data []byte) {
+		err := util.ReadUrlAsStream(urlString, chunkView.CipherKey, chunkView.IsFullChunk, chunkView.Offset, int(chunkView.Size), func(data []byte) {
 			w.Write(data)
 		})
 		if err != nil {
diff --git a/weed/filesys/dirty_page.go b/weed/filesys/dirty_page.go
index 67e1d57ef..ff3b8f885 100644
--- a/weed/filesys/dirty_page.go
+++ b/weed/filesys/dirty_page.go
@@ -174,7 +174,7 @@ func (pages *ContinuousDirtyPages) saveToStorage(reader io.Reader, offset int64,
 	}
 
 	fileUrl := fmt.Sprintf("http://%s/%s", host, fileId)
-	uploadResult, err := operation.Upload(fileUrl, pages.f.Name, reader, false, "", nil, auth)
+	uploadResult, err := operation.Upload(fileUrl, pages.f.Name, pages.f.wfs.option.Cipher, reader, false, "", 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)
@@ -185,11 +185,12 @@ func (pages *ContinuousDirtyPages) saveToStorage(reader io.Reader, offset int64,
 	}
 
 	return &filer_pb.FileChunk{
-		FileId: fileId,
-		Offset: offset,
-		Size:   uint64(size),
-		Mtime:  time.Now().UnixNano(),
-		ETag:   uploadResult.ETag,
+		FileId:    fileId,
+		Offset:    offset,
+		Size:      uint64(size),
+		Mtime:     time.Now().UnixNano(),
+		ETag:      uploadResult.ETag,
+		CipherKey: uploadResult.CipherKey,
 	}, nil
 
 }
diff --git a/weed/filesys/wfs.go b/weed/filesys/wfs.go
index 83826fed5..77438b58e 100644
--- a/weed/filesys/wfs.go
+++ b/weed/filesys/wfs.go
@@ -39,8 +39,9 @@ type Option struct {
 	MountCtime time.Time
 	MountMtime time.Time
 
-	// whether the mount runs outside SeaweedFS containers
-	OutsideContainerClusterMode bool
+	OutsideContainerClusterMode bool // whether the mount runs outside SeaweedFS containers
+	Cipher                      bool // whether encrypt data on volume server
+
 }
 
 var _ = fs.FS(&WFS{})
diff --git a/weed/operation/submit.go b/weed/operation/submit.go
index 62f067430..8c7ed5d7b 100644
--- a/weed/operation/submit.go
+++ b/weed/operation/submit.go
@@ -189,7 +189,7 @@ func (fi FilePart) Upload(maxMB int, master string, jwt security.EncodedJwt, grp
 			cm.DeleteChunks(master, grpcDialOption)
 		}
 	} else {
-		ret, e := Upload(fileUrl, baseName, fi.Reader, false, fi.MimeType, nil, jwt)
+		ret, e := Upload(fileUrl, baseName, false, fi.Reader, false, fi.MimeType, nil, jwt)
 		if e != nil {
 			return 0, e
 		}
@@ -202,8 +202,7 @@ func upload_one_chunk(filename string, reader io.Reader, master,
 	fileUrl string, jwt security.EncodedJwt,
 ) (size uint32, e error) {
 	glog.V(4).Info("Uploading part ", filename, " to ", fileUrl, "...")
-	uploadResult, uploadError := Upload(fileUrl, filename, reader, false,
-		"", nil, jwt)
+	uploadResult, uploadError := Upload(fileUrl, filename, false, reader, false, "", nil, jwt)
 	if uploadError != nil {
 		return 0, uploadError
 	}
@@ -221,6 +220,6 @@ func upload_chunked_file_manifest(fileUrl string, manifest *ChunkManifest, jwt s
 	q := u.Query()
 	q.Set("cm", "true")
 	u.RawQuery = q.Encode()
-	_, e = Upload(u.String(), manifest.Name, bufReader, false, "application/json", nil, jwt)
+	_, e = Upload(u.String(), manifest.Name, false, bufReader, false, "application/json", nil, jwt)
 	return e
 }
diff --git a/weed/operation/upload_content.go b/weed/operation/upload_content.go
index c387d0230..ba15aea78 100644
--- a/weed/operation/upload_content.go
+++ b/weed/operation/upload_content.go
@@ -22,10 +22,11 @@ import (
 )
 
 type UploadResult struct {
-	Name  string `json:"name,omitempty"`
-	Size  uint32 `json:"size,omitempty"`
-	Error string `json:"error,omitempty"`
-	ETag  string `json:"eTag,omitempty"`
+	Name      string `json:"name,omitempty"`
+	Size      uint32 `json:"size,omitempty"`
+	Error     string `json:"error,omitempty"`
+	ETag      string `json:"eTag,omitempty"`
+	CipherKey []byte `json:"cipherKey,omitempty"`
 }
 
 var (
@@ -41,22 +42,22 @@ func init() {
 var fileNameEscaper = strings.NewReplacer("\\", "\\\\", "\"", "\\\"")
 
 // Upload sends a POST request to a volume server to upload the content with adjustable compression level
-func UploadWithLocalCompressionLevel(uploadUrl string, filename string, reader io.Reader, isGzipped bool, mtype string, pairMap map[string]string, jwt security.EncodedJwt, compressionLevel int) (*UploadResult, error) {
+func UploadWithLocalCompressionLevel(uploadUrl string, filename string, cipher bool, reader io.Reader, isGzipped bool, mtype string, pairMap map[string]string, jwt security.EncodedJwt, compressionLevel int) (*UploadResult, error) {
 	if compressionLevel < 1 {
 		compressionLevel = 1
 	}
 	if compressionLevel > 9 {
 		compressionLevel = 9
 	}
-	return doUpload(uploadUrl, filename, reader, isGzipped, mtype, pairMap, compressionLevel, jwt)
+	return doUpload(uploadUrl, filename, cipher, reader, isGzipped, mtype, pairMap, compressionLevel, jwt)
 }
 
 // Upload sends a POST request to a volume server to upload the content with fast compression
-func Upload(uploadUrl string, filename string, reader io.Reader, isGzipped bool, mtype string, pairMap map[string]string, jwt security.EncodedJwt) (*UploadResult, error) {
-	return doUpload(uploadUrl, filename, reader, isGzipped, mtype, pairMap, flate.BestSpeed, jwt)
+func Upload(uploadUrl string, filename string, cipher bool, reader io.Reader, isGzipped bool, mtype string, pairMap map[string]string, jwt security.EncodedJwt) (*UploadResult, error) {
+	return doUpload(uploadUrl, filename, cipher, reader, isGzipped, mtype, pairMap, flate.BestSpeed, jwt)
 }
 
-func doUpload(uploadUrl string, filename string, reader io.Reader, isGzipped bool, mtype string, pairMap map[string]string, compression int, jwt security.EncodedJwt) (*UploadResult, error) {
+func doUpload(uploadUrl string, filename string, cipher bool, reader io.Reader, isGzipped bool, mtype string, pairMap map[string]string, compression int, jwt security.EncodedJwt) (*UploadResult, error) {
 	contentIsGzipped := isGzipped
 	shouldGzipNow := false
 	if !isGzipped {
@@ -65,7 +66,25 @@ func doUpload(uploadUrl string, filename string, reader io.Reader, isGzipped boo
 			contentIsGzipped = true
 		}
 	}
-	return upload_content(uploadUrl, func(w io.Writer) (err error) {
+	// encrypt data
+	var cipherKey util.CipherKey
+	var clearDataLen int
+	if cipher {
+		clearData, err := ioutil.ReadAll(reader)
+		if err != nil {
+			return nil, fmt.Errorf("read raw input: %v", err)
+		}
+		clearDataLen = len(clearData)
+		cipherKey = util.GenCipherKey()
+		encryptedData, err := util.Encrypt(clearData, cipherKey)
+		if err != nil {
+			return nil, fmt.Errorf("encrypt input: %v", err)
+		}
+		reader = bytes.NewReader(encryptedData)
+	}
+
+	// upload data
+	uploadResult, err := upload_content(uploadUrl, func(w io.Writer) (err error) {
 		if shouldGzipNow {
 			gzWriter, _ := gzip.NewWriterLevel(w, compression)
 			_, err = io.Copy(gzWriter, reader)
@@ -75,6 +94,14 @@ func doUpload(uploadUrl string, filename string, reader io.Reader, isGzipped boo
 		}
 		return
 	}, filename, contentIsGzipped, mtype, pairMap, jwt)
+
+	// remember cipher key
+	if uploadResult != nil && cipherKey != nil {
+		uploadResult.CipherKey = cipherKey
+		uploadResult.Size = uint32(clearDataLen)
+	}
+
+	return uploadResult, err
 }
 
 func upload_content(uploadUrl string, fillBufferFunction func(w io.Writer) error, filename string, isGzipped bool, mtype string, pairMap map[string]string, jwt security.EncodedJwt) (*UploadResult, error) {
diff --git a/weed/pb/filer.proto b/weed/pb/filer.proto
index 9ee552561..5983c84d8 100644
--- a/weed/pb/filer.proto
+++ b/weed/pb/filer.proto
@@ -99,6 +99,7 @@ message FileChunk {
     string source_file_id = 6; // to be deprecated
     FileId fid = 7;
     FileId source_fid = 8;
+    bytes cipher_key = 9;
 }
 
 message FileId {
@@ -229,4 +230,5 @@ message GetFilerConfigurationResponse {
     uint32 max_mb = 4;
     string dir_buckets = 5;
     string dir_queues = 6;
+    bool cipher = 7;
 }
diff --git a/weed/pb/filer_pb/filer.pb.go b/weed/pb/filer_pb/filer.pb.go
index 269abb8c7..92a12321c 100644
--- a/weed/pb/filer_pb/filer.pb.go
+++ b/weed/pb/filer_pb/filer.pb.go
@@ -287,6 +287,7 @@ type FileChunk struct {
 	SourceFileId string  `protobuf:"bytes,6,opt,name=source_file_id,json=sourceFileId" json:"source_file_id,omitempty"`
 	Fid          *FileId `protobuf:"bytes,7,opt,name=fid" json:"fid,omitempty"`
 	SourceFid    *FileId `protobuf:"bytes,8,opt,name=source_fid,json=sourceFid" json:"source_fid,omitempty"`
+	CipherKey    []byte  `protobuf:"bytes,9,opt,name=cipher_key,json=cipherKey,proto3" json:"cipher_key,omitempty"`
 }
 
 func (m *FileChunk) Reset()                    { *m = FileChunk{} }
@@ -350,6 +351,13 @@ func (m *FileChunk) GetSourceFid() *FileId {
 	return nil
 }
 
+func (m *FileChunk) GetCipherKey() []byte {
+	if m != nil {
+		return m.CipherKey
+	}
+	return nil
+}
+
 type FileId struct {
 	VolumeId uint32 `protobuf:"varint,1,opt,name=volume_id,json=volumeId" json:"volume_id,omitempty"`
 	FileKey  uint64 `protobuf:"varint,2,opt,name=file_key,json=fileKey" json:"file_key,omitempty"`
@@ -1014,6 +1022,7 @@ type GetFilerConfigurationResponse struct {
 	MaxMb       uint32   `protobuf:"varint,4,opt,name=max_mb,json=maxMb" json:"max_mb,omitempty"`
 	DirBuckets  string   `protobuf:"bytes,5,opt,name=dir_buckets,json=dirBuckets" json:"dir_buckets,omitempty"`
 	DirQueues   string   `protobuf:"bytes,6,opt,name=dir_queues,json=dirQueues" json:"dir_queues,omitempty"`
+	Cipher      bool     `protobuf:"varint,7,opt,name=cipher" json:"cipher,omitempty"`
 }
 
 func (m *GetFilerConfigurationResponse) Reset()                    { *m = GetFilerConfigurationResponse{} }
@@ -1063,6 +1072,13 @@ func (m *GetFilerConfigurationResponse) GetDirQueues() string {
 	return ""
 }
 
+func (m *GetFilerConfigurationResponse) GetCipher() bool {
+	if m != nil {
+		return m.Cipher
+	}
+	return false
+}
+
 func init() {
 	proto.RegisterType((*LookupDirectoryEntryRequest)(nil), "filer_pb.LookupDirectoryEntryRequest")
 	proto.RegisterType((*LookupDirectoryEntryResponse)(nil), "filer_pb.LookupDirectoryEntryResponse")
@@ -1594,113 +1610,114 @@ var _SeaweedFiler_serviceDesc = grpc.ServiceDesc{
 func init() { proto.RegisterFile("filer.proto", fileDescriptor0) }
 
 var fileDescriptor0 = []byte{
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+	0x45, 0x39, 0x54, 0x04, 0xe7, 0x2e, 0x6c, 0xff, 0x92, 0x4a, 0xb5, 0x3b, 0x89, 0x43, 0x9e, 0xcc,
+	0xd9, 0x22, 0x17, 0xbe, 0x11, 0x0a, 0xe7, 0xdf, 0x16, 0xec, 0x5c, 0x22, 0x50, 0x3c, 0x78, 0x0a,
+	0xfd, 0xd8, 0xcf, 0x24, 0x15, 0x65, 0x95, 0x94, 0xc7, 0x55, 0x28, 0x5a, 0xd7, 0x41, 0xd1, 0x6e,
+	0x40, 0x71, 0x0b, 0x7a, 0xb1, 0x7f, 0xe1, 0xc5, 0x27, 0xc5, 0x72, 0xd4, 0x8d, 0xfd, 0x8b, 0x97,
+	0x27, 0xd8, 0xd9, 0x98, 0xf0, 0x4e, 0xf2, 0xe0, 0x8c, 0xca, 0xac, 0xea, 0x6c, 0x4c, 0x3c, 0xd1,
+	0x14, 0xf5, 0x68, 0x25, 0xf0, 0x4d, 0x4e, 0x73, 0x9a, 0x15, 0xbd, 0x42, 0x0d, 0xc7, 0x5f, 0x21,
+	0x01, 0x97, 0x29, 0x5c, 0x1d, 0xb1, 0x4b, 0x0c, 0xdc, 0xe2, 0x74, 0xf0, 0x97, 0x01, 0x8c, 0x8e,
+	0xa9, 0x7f, 0x4e, 0x69, 0x88, 0x0f, 0x26, 0x8b, 0xb2, 0xd0, 0xea, 0xbf, 0x6c, 0xc9, 0xfd, 0xd5,
+	0x8a, 0x5a, 0xfb, 0x53, 0x7a, 0xf6, 0xc9, 0x75, 0x62, 0x45, 0xce, 0xde, 0x20, 0xaf, 0x60, 0x68,
+	0xfc, 0x74, 0x24, 0xdb, 0x86, 0x62, 0xe3, 0x17, 0xf1, 0x6c, 0xe7, 0x12, 0x6e, 0x69, 0xed, 0x91,
+	0x45, 0x5e, 0xc0, 0xd0, 0x58, 0x69, 0x4c, 0x7b, 0xcd, 0xdd, 0xca, 0xb4, 0xb7, 0x66, 0x0f, 0x72,
+	0x6e, 0x28, 0x6b, 0xc6, 0x62, 0x62, 0x5a, 0x6b, 0xae, 0x42, 0xa6, 0xb5, 0x75, 0xdb, 0x0c, 0x5a,
+	0x33, 0xf6, 0x00, 0xd3, 0x5a, 0x73, 0xcb, 0x31, 0xad, 0xad, 0x59, 0x1e, 0x9c, 0x1b, 0xe4, 0x6b,
+	0x98, 0x1c, 0x4b, 0x41, 0xfd, 0x78, 0xc9, 0x5e, 0x41, 0xf0, 0x7f, 0xb0, 0xba, 0x67, 0x3d, 0xb2,
+	0xc8, 0xef, 0x60, 0xb3, 0x31, 0xe5, 0x89, 0xb3, 0xd4, 0xbc, 0x6c, 0x3d, 0x99, 0xdd, 0xbb, 0x52,
+	0xa6, 0xf2, 0xfc, 0x2b, 0x18, 0x99, 0xc3, 0x95, 0x18, 0x4e, 0xad, 0xd9, 0x1f, 0x66, 0x77, 0x2f,
+	0x63, 0x9b, 0x06, 0xcd, 0xfe, 0x6e, 0x1a, 0x5c, 0x33, 0xe1, 0x4c, 0x83, 0xeb, 0xc6, 0x82, 0x73,
+	0x83, 0xfc, 0x16, 0x36, 0x56, 0xfb, 0x2c, 0xf9, 0x78, 0x15, 0xba, 0x46, 0xfb, 0x9e, 0x39, 0x57,
+	0x89, 0x54, 0xc6, 0x9f, 0x03, 0x2c, 0xdb, 0x27, 0xb9, 0xb3, 0xd4, 0x69, 0xb4, 0xef, 0xd9, 0xf6,
+	0x7a, 0x66, 0x65, 0xea, 0xf7, 0x70, 0x6b, 0x6d, 0x8f, 0x22, 0x46, 0x01, 0x5e, 0xd5, 0xe5, 0x66,
+	0x3f, 0xba, 0x56, 0xae, 0xbc, 0xeb, 0xc9, 0x5d, 0xd8, 0xc8, 0x74, 0x8b, 0x98, 0x67, 0xfb, 0x41,
+	0xc4, 0x68, 0x22, 0x9f, 0x00, 0x6a, 0xbc, 0x16, 0x5c, 0xf2, 0x93, 0x1e, 0xfe, 0xdd, 0xf6, 0xd3,
+	0xff, 0x06, 0x00, 0x00, 0xff, 0xff, 0xf6, 0xb5, 0x1d, 0x19, 0x7d, 0x13, 0x00, 0x00,
 }
diff --git a/weed/pb/master_pb/master.pb.go b/weed/pb/master_pb/master.pb.go
index 95c9533a1..c33e2b768 100644
--- a/weed/pb/master_pb/master.pb.go
+++ b/weed/pb/master_pb/master.pb.go
@@ -428,12 +428,10 @@ type VolumeEcShardInformationMessage struct {
 	EcIndexBits uint32 `protobuf:"varint,3,opt,name=ec_index_bits,json=ecIndexBits" json:"ec_index_bits,omitempty"`
 }
 
-func (m *VolumeEcShardInformationMessage) Reset()         { *m = VolumeEcShardInformationMessage{} }
-func (m *VolumeEcShardInformationMessage) String() string { return proto.CompactTextString(m) }
-func (*VolumeEcShardInformationMessage) ProtoMessage()    {}
-func (*VolumeEcShardInformationMessage) Descriptor() ([]byte, []int) {
-	return fileDescriptor0, []int{4}
-}
+func (m *VolumeEcShardInformationMessage) Reset()                    { *m = VolumeEcShardInformationMessage{} }
+func (m *VolumeEcShardInformationMessage) String() string            { return proto.CompactTextString(m) }
+func (*VolumeEcShardInformationMessage) ProtoMessage()               {}
+func (*VolumeEcShardInformationMessage) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{4} }
 
 func (m *VolumeEcShardInformationMessage) GetId() uint32 {
 	if m != nil {
@@ -1424,12 +1422,10 @@ type GetMasterConfigurationResponse struct {
 	MetricsIntervalSeconds uint32 `protobuf:"varint,2,opt,name=metrics_interval_seconds,json=metricsIntervalSeconds" json:"metrics_interval_seconds,omitempty"`
 }
 
-func (m *GetMasterConfigurationResponse) Reset()         { *m = GetMasterConfigurationResponse{} }
-func (m *GetMasterConfigurationResponse) String() string { return proto.CompactTextString(m) }
-func (*GetMasterConfigurationResponse) ProtoMessage()    {}
-func (*GetMasterConfigurationResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor0, []int{32}
-}
+func (m *GetMasterConfigurationResponse) Reset()                    { *m = GetMasterConfigurationResponse{} }
+func (m *GetMasterConfigurationResponse) String() string            { return proto.CompactTextString(m) }
+func (*GetMasterConfigurationResponse) ProtoMessage()               {}
+func (*GetMasterConfigurationResponse) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{32} }
 
 func (m *GetMasterConfigurationResponse) GetMetricsAddress() string {
 	if m != nil {
diff --git a/weed/pb/volume_server_pb/volume_server.pb.go b/weed/pb/volume_server_pb/volume_server.pb.go
index 588b18f2e..56baa0cf7 100644
--- a/weed/pb/volume_server_pb/volume_server.pb.go
+++ b/weed/pb/volume_server_pb/volume_server.pb.go
@@ -1035,12 +1035,10 @@ func (m *VolumeEcShardsGenerateRequest) GetCollection() string {
 type VolumeEcShardsGenerateResponse struct {
 }
 
-func (m *VolumeEcShardsGenerateResponse) Reset()         { *m = VolumeEcShardsGenerateResponse{} }
-func (m *VolumeEcShardsGenerateResponse) String() string { return proto.CompactTextString(m) }
-func (*VolumeEcShardsGenerateResponse) ProtoMessage()    {}
-func (*VolumeEcShardsGenerateResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor0, []int{41}
-}
+func (m *VolumeEcShardsGenerateResponse) Reset()                    { *m = VolumeEcShardsGenerateResponse{} }
+func (m *VolumeEcShardsGenerateResponse) String() string            { return proto.CompactTextString(m) }
+func (*VolumeEcShardsGenerateResponse) ProtoMessage()               {}
+func (*VolumeEcShardsGenerateResponse) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{41} }
 
 type VolumeEcShardsRebuildRequest struct {
 	VolumeId   uint32 `protobuf:"varint,1,opt,name=volume_id,json=volumeId" json:"volume_id,omitempty"`
@@ -1413,12 +1411,10 @@ func (m *VolumeEcShardsToVolumeRequest) GetCollection() string {
 type VolumeEcShardsToVolumeResponse struct {
 }
 
-func (m *VolumeEcShardsToVolumeResponse) Reset()         { *m = VolumeEcShardsToVolumeResponse{} }
-func (m *VolumeEcShardsToVolumeResponse) String() string { return proto.CompactTextString(m) }
-func (*VolumeEcShardsToVolumeResponse) ProtoMessage()    {}
-func (*VolumeEcShardsToVolumeResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor0, []int{57}
-}
+func (m *VolumeEcShardsToVolumeResponse) Reset()                    { *m = VolumeEcShardsToVolumeResponse{} }
+func (m *VolumeEcShardsToVolumeResponse) String() string            { return proto.CompactTextString(m) }
+func (*VolumeEcShardsToVolumeResponse) ProtoMessage()               {}
+func (*VolumeEcShardsToVolumeResponse) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{57} }
 
 type ReadVolumeFileStatusRequest struct {
 	VolumeId uint32 `protobuf:"varint,1,opt,name=volume_id,json=volumeId" json:"volume_id,omitempty"`
@@ -2085,10 +2081,8 @@ type QueryRequest_InputSerialization_JSONInput struct {
 func (m *QueryRequest_InputSerialization_JSONInput) Reset() {
 	*m = QueryRequest_InputSerialization_JSONInput{}
 }
-func (m *QueryRequest_InputSerialization_JSONInput) String() string {
-	return proto.CompactTextString(m)
-}
-func (*QueryRequest_InputSerialization_JSONInput) ProtoMessage() {}
+func (m *QueryRequest_InputSerialization_JSONInput) String() string { return proto.CompactTextString(m) }
+func (*QueryRequest_InputSerialization_JSONInput) ProtoMessage()    {}
 func (*QueryRequest_InputSerialization_JSONInput) Descriptor() ([]byte, []int) {
 	return fileDescriptor0, []int{70, 1, 1}
 }
diff --git a/weed/replication/sink/azuresink/azure_sink.go b/weed/replication/sink/azuresink/azure_sink.go
index f7c0eef0d..66e7b9c3e 100644
--- a/weed/replication/sink/azuresink/azure_sink.go
+++ b/weed/replication/sink/azuresink/azure_sink.go
@@ -115,7 +115,7 @@ func (g *AzureSink) CreateEntry(key string, entry *filer_pb.Entry) error {
 		}
 
 		var writeErr error
-		_, readErr := util.ReadUrlAsStream(fileUrl, chunk.Offset, int(chunk.Size), func(data []byte) {
+		readErr := util.ReadUrlAsStream(fileUrl, nil, chunk.IsFullChunk, chunk.Offset, int(chunk.Size), func(data []byte) {
 			_, writeErr = appendBlobURL.AppendBlock(context.Background(), bytes.NewReader(data), azblob.AppendBlobAccessConditions{}, nil)
 		})
 
diff --git a/weed/replication/sink/b2sink/b2_sink.go b/weed/replication/sink/b2sink/b2_sink.go
index e687170dd..0f8313638 100644
--- a/weed/replication/sink/b2sink/b2_sink.go
+++ b/weed/replication/sink/b2sink/b2_sink.go
@@ -103,7 +103,7 @@ func (g *B2Sink) CreateEntry(key string, entry *filer_pb.Entry) error {
 		}
 
 		var writeErr error
-		_, readErr := util.ReadUrlAsStream(fileUrl, chunk.Offset, int(chunk.Size), func(data []byte) {
+		readErr := util.ReadUrlAsStream(fileUrl, nil, chunk.IsFullChunk, chunk.Offset, int(chunk.Size), func(data []byte) {
 			_, err := writer.Write(data)
 			if err != nil {
 				writeErr = err
diff --git a/weed/replication/sink/filersink/fetch_write.go b/weed/replication/sink/filersink/fetch_write.go
index 232b68fec..512fbd46b 100644
--- a/weed/replication/sink/filersink/fetch_write.go
+++ b/weed/replication/sink/filersink/fetch_write.go
@@ -50,6 +50,7 @@ func (fs *FilerSink) replicateOneChunk(sourceChunk *filer_pb.FileChunk, dir stri
 		Mtime:        sourceChunk.Mtime,
 		ETag:         sourceChunk.ETag,
 		SourceFileId: sourceChunk.GetFileIdString(),
+		CipherKey:    sourceChunk.CipherKey,
 	}, nil
 }
 
@@ -95,8 +96,8 @@ func (fs *FilerSink) fetchAndWrite(sourceChunk *filer_pb.FileChunk, dir string)
 
 	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, auth)
+	// fetch data as is, regardless whether it is encrypted or not
+	uploadResult, err := operation.Upload(fileUrl, filename, false, readCloser, "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)
diff --git a/weed/replication/sink/gcssink/gcs_sink.go b/weed/replication/sink/gcssink/gcs_sink.go
index d5b1e137f..dd8567e0e 100644
--- a/weed/replication/sink/gcssink/gcs_sink.go
+++ b/weed/replication/sink/gcssink/gcs_sink.go
@@ -6,13 +6,14 @@ import (
 	"os"
 
 	"cloud.google.com/go/storage"
+	"google.golang.org/api/option"
+
 	"github.com/chrislusf/seaweedfs/weed/filer2"
 	"github.com/chrislusf/seaweedfs/weed/glog"
 	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
 	"github.com/chrislusf/seaweedfs/weed/replication/sink"
 	"github.com/chrislusf/seaweedfs/weed/replication/source"
 	"github.com/chrislusf/seaweedfs/weed/util"
-	"google.golang.org/api/option"
 )
 
 type GcsSink struct {
@@ -100,7 +101,7 @@ func (g *GcsSink) CreateEntry(key string, entry *filer_pb.Entry) error {
 			return err
 		}
 
-		_, err = util.ReadUrlAsStream(fileUrl, chunk.Offset, int(chunk.Size), func(data []byte) {
+		err = util.ReadUrlAsStream(fileUrl, nil, chunk.IsFullChunk, chunk.Offset, int(chunk.Size), func(data []byte) {
 			wc.Write(data)
 		})
 
diff --git a/weed/replication/sink/s3sink/s3_write.go b/weed/replication/sink/s3sink/s3_write.go
index 60885c30c..dcc041642 100644
--- a/weed/replication/sink/s3sink/s3_write.go
+++ b/weed/replication/sink/s3sink/s3_write.go
@@ -162,6 +162,6 @@ func (s3sink *S3Sink) buildReadSeeker(chunk *filer2.ChunkView) (io.ReadSeeker, e
 		return nil, err
 	}
 	buf := make([]byte, chunk.Size)
-	util.ReadUrl(fileUrl, chunk.Offset, int(chunk.Size), buf, true)
+	util.ReadUrl(fileUrl, nil, false, chunk.Offset, int(chunk.Size), buf)
 	return bytes.NewReader(buf), nil
 }
diff --git a/weed/server/common.go b/weed/server/common.go
index 31a9a73b8..d7ab8d1ee 100644
--- a/weed/server/common.go
+++ b/weed/server/common.go
@@ -134,7 +134,7 @@ 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, assignResult.Auth)
+	uploadResult, err := operation.Upload(url, fname, false, 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 35539acca..b000bf3a6 100644
--- a/weed/server/filer_grpc_server.go
+++ b/weed/server/filer_grpc_server.go
@@ -338,5 +338,6 @@ func (fs *FilerServer) GetFilerConfiguration(ctx context.Context, req *filer_pb.
 		MaxMb:       uint32(fs.option.MaxMB),
 		DirBuckets:  fs.filer.DirBucketsPath,
 		DirQueues:   fs.filer.DirQueuesPath,
+		Cipher:      fs.filer.Cipher,
 	}, nil
 }
diff --git a/weed/server/filer_server.go b/weed/server/filer_server.go
index 57caeb6d4..4c493b6b3 100644
--- a/weed/server/filer_server.go
+++ b/weed/server/filer_server.go
@@ -46,6 +46,7 @@ type FilerOption struct {
 	DisableHttp        bool
 	Port               uint32
 	recursiveDelete    bool
+	Cipher             bool
 }
 
 type FilerServer struct {
@@ -67,6 +68,7 @@ func NewFilerServer(defaultMux, readonlyMux *http.ServeMux, option *FilerOption)
 	}
 
 	fs.filer = filer2.NewFiler(option.Masters, fs.grpcDialOption, option.Port+10000)
+	fs.filer.Cipher = option.Cipher
 
 	go fs.filer.KeepConnectedToMaster()
 
diff --git a/weed/server/filer_server_handlers_read.go b/weed/server/filer_server_handlers_read.go
index ba21298ba..aff2b9159 100644
--- a/weed/server/filer_server_handlers_read.go
+++ b/weed/server/filer_server_handlers_read.go
@@ -14,6 +14,7 @@ import (
 
 	"github.com/chrislusf/seaweedfs/weed/filer2"
 	"github.com/chrislusf/seaweedfs/weed/glog"
+	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
 	"github.com/chrislusf/seaweedfs/weed/stats"
 	"github.com/chrislusf/seaweedfs/weed/util"
 )
@@ -93,7 +94,7 @@ func (fs *FilerServer) handleSingleChunk(w http.ResponseWriter, r *http.Request,
 		return
 	}
 
-	if fs.option.RedirectOnRead {
+	if fs.option.RedirectOnRead && entry.Chunks[0].CipherKey == nil {
 		stats.FilerRequestCounter.WithLabelValues("redirect").Inc()
 		http.Redirect(w, r, urlString, http.StatusFound)
 		return
@@ -136,7 +137,27 @@ func (fs *FilerServer) handleSingleChunk(w http.ResponseWriter, r *http.Request,
 		w.Header().Set("Content-Type", entry.Attr.Mime)
 	}
 	w.WriteHeader(resp.StatusCode)
-	io.Copy(w, resp.Body)
+	if entry.Chunks[0].CipherKey == nil {
+		io.Copy(w, resp.Body)
+	} else {
+		fs.writeEncryptedChunk(w, resp, entry.Chunks[0])
+	}
+}
+
+func (fs *FilerServer) writeEncryptedChunk(w http.ResponseWriter, resp *http.Response, chunk *filer_pb.FileChunk) {
+	encryptedData, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		glog.V(1).Infof("read encrypted %s failed, err: %v", chunk.FileId, err)
+		w.WriteHeader(http.StatusNotFound)
+		return
+	}
+	decryptedData, err := util.Decrypt(encryptedData, util.CipherKey(chunk.CipherKey))
+	if err != nil {
+		glog.V(1).Infof("decrypt %s failed, err: %v", chunk.FileId, err)
+		w.WriteHeader(http.StatusNotFound)
+		return
+	}
+	w.Write(decryptedData)
 }
 
 func (fs *FilerServer) handleMultipleChunks(w http.ResponseWriter, r *http.Request, entry *filer2.Entry) {
diff --git a/weed/server/filer_server_handlers_write_autochunk.go b/weed/server/filer_server_handlers_write_autochunk.go
index 45cad480d..c8eadf82a 100644
--- a/weed/server/filer_server_handlers_write_autochunk.go
+++ b/weed/server/filer_server_handlers_write_autochunk.go
@@ -182,7 +182,7 @@ func (fs *FilerServer) doUpload(urlLocation string, w http.ResponseWriter, r *ht
 		stats.FilerRequestHistogram.WithLabelValues("postAutoChunkUpload").Observe(time.Since(start).Seconds())
 	}()
 
-	uploadResult, uploadError := operation.Upload(urlLocation, fileName, limitedReader, false, contentType, nil, auth)
+	uploadResult, uploadError := operation.Upload(urlLocation, fileName, fs.option.Cipher, limitedReader, false, contentType, nil, auth)
 	if uploadError != nil {
 		return 0, uploadError
 	}
diff --git a/weed/server/webdav_server.go b/weed/server/webdav_server.go
index a07f6be01..9451fdf99 100644
--- a/weed/server/webdav_server.go
+++ b/weed/server/webdav_server.go
@@ -32,6 +32,7 @@ type WebDavOption struct {
 	Collection       string
 	Uid              uint32
 	Gid              uint32
+	Cipher           bool
 }
 
 type WebDavServer struct {
@@ -418,7 +419,7 @@ func (f *WebDavFile) Write(buf []byte) (int, error) {
 
 	fileUrl := fmt.Sprintf("http://%s/%s", host, fileId)
 	bufReader := bytes.NewReader(buf)
-	uploadResult, err := operation.Upload(fileUrl, f.name, bufReader, false, "", nil, auth)
+	uploadResult, err := operation.Upload(fileUrl, f.name, f.fs.option.Cipher, bufReader, false, "", nil, auth)
 	if err != nil {
 		glog.V(0).Infof("upload data %v to %s: %v", f.name, fileUrl, err)
 		return 0, fmt.Errorf("upload data: %v", err)
@@ -429,11 +430,12 @@ func (f *WebDavFile) Write(buf []byte) (int, error) {
 	}
 
 	chunk := &filer_pb.FileChunk{
-		FileId: fileId,
-		Offset: f.off,
-		Size:   uint64(len(buf)),
-		Mtime:  time.Now().UnixNano(),
-		ETag:   uploadResult.ETag,
+		FileId:    fileId,
+		Offset:    f.off,
+		Size:      uint64(len(buf)),
+		Mtime:     time.Now().UnixNano(),
+		ETag:      uploadResult.ETag,
+		CipherKey: uploadResult.CipherKey,
 	}
 
 	f.entry.Chunks = append(f.entry.Chunks, chunk)
diff --git a/weed/topology/store_replicate.go b/weed/topology/store_replicate.go
index b195b48ed..332ec4d65 100644
--- a/weed/topology/store_replicate.go
+++ b/weed/topology/store_replicate.go
@@ -72,9 +72,8 @@ func ReplicatedWrite(masterNode string, s *storage.Store,
 				}
 			}
 
-			_, err := operation.Upload(u.String(),
-				string(n.Name), bytes.NewReader(n.Data), n.IsGzipped(), string(n.Mime),
-				pairMap, jwt)
+			// volume server do not know about encryption
+			_, err := operation.Upload(u.String(), string(n.Name), false, bytes.NewReader(n.Data), n.IsGzipped(), string(n.Mime), pairMap, jwt)
 			return err
 		}); err != nil {
 			size = 0
diff --git a/weed/util/cipher.go b/weed/util/cipher.go
new file mode 100644
index 000000000..f044c2ca3
--- /dev/null
+++ b/weed/util/cipher.go
@@ -0,0 +1,60 @@
+package util
+
+import (
+	"crypto/aes"
+	"crypto/cipher"
+	"crypto/rand"
+	"errors"
+	"io"
+
+	"github.com/chrislusf/seaweedfs/weed/glog"
+)
+
+type CipherKey []byte
+
+func GenCipherKey() CipherKey {
+	key := make([]byte, 32)
+	if _, err := io.ReadFull(rand.Reader, key); err != nil {
+		glog.Fatalf("random key gen: %v", err)
+	}
+	return CipherKey(key)
+}
+
+func Encrypt(plaintext []byte, key CipherKey) ([]byte, error) {
+	c, err := aes.NewCipher(key)
+	if err != nil {
+		return nil, err
+	}
+
+	gcm, err := cipher.NewGCM(c)
+	if err != nil {
+		return nil, err
+	}
+
+	nonce := make([]byte, gcm.NonceSize())
+	if _, err = io.ReadFull(rand.Reader, nonce); err != nil {
+		return nil, err
+	}
+
+	return gcm.Seal(nonce, nonce, plaintext, nil), nil
+}
+
+func Decrypt(ciphertext []byte, key CipherKey) ([]byte, error) {
+	c, err := aes.NewCipher(key)
+	if err != nil {
+		return nil, err
+	}
+
+	gcm, err := cipher.NewGCM(c)
+	if err != nil {
+		return nil, err
+	}
+
+	nonceSize := gcm.NonceSize()
+	if len(ciphertext) < nonceSize {
+		return nil, errors.New("ciphertext too short")
+	}
+
+	nonce, ciphertext := ciphertext[:nonceSize], ciphertext[nonceSize:]
+	return gcm.Open(nil, nonce, ciphertext, nil)
+}
diff --git a/weed/util/http_util.go b/weed/util/http_util.go
index f819d8497..833db910c 100644
--- a/weed/util/http_util.go
+++ b/weed/util/http_util.go
@@ -189,13 +189,21 @@ func NormalizeUrl(url string) string {
 	return "http://" + url
 }
 
-func ReadUrl(fileUrl string, offset int64, size int, buf []byte, isReadRange bool) (int64, error) {
+func ReadUrl(fileUrl string, cipherKey []byte, isFullChunk bool, offset int64, size int, buf []byte) (int64, error) {
+
+	if cipherKey != nil {
+		var n int
+		err := readEncryptedUrl(fileUrl, cipherKey, offset, size, func(data []byte) {
+			n = copy(buf, data)
+		})
+		return int64(n), err
+	}
 
 	req, err := http.NewRequest("GET", fileUrl, nil)
 	if err != nil {
 		return 0, err
 	}
-	if isReadRange {
+	if !isFullChunk {
 		req.Header.Add("Range", fmt.Sprintf("bytes=%d-%d", offset, offset+int64(size)-1))
 	} else {
 		req.Header.Set("Accept-Encoding", "gzip")
@@ -250,43 +258,64 @@ func ReadUrl(fileUrl string, offset int64, size int, buf []byte, isReadRange boo
 	return n, err
 }
 
-func ReadUrlAsStream(fileUrl string, offset int64, size int, fn func(data []byte)) (int64, error) {
+func ReadUrlAsStream(fileUrl string, cipherKey []byte, isFullChunk bool, offset int64, size int, fn func(data []byte)) error {
+
+	if cipherKey != nil {
+		return readEncryptedUrl(fileUrl, cipherKey, offset, size, fn)
+	}
 
 	req, err := http.NewRequest("GET", fileUrl, nil)
 	if err != nil {
-		return 0, err
+		return err
+	}
+
+	if !isFullChunk {
+		req.Header.Add("Range", fmt.Sprintf("bytes=%d-%d", offset, offset+int64(size)-1))
 	}
-	req.Header.Add("Range", fmt.Sprintf("bytes=%d-%d", offset, offset+int64(size)-1))
 
 	r, err := client.Do(req)
 	if err != nil {
-		return 0, err
+		return err
 	}
 	defer CloseResponse(r)
 	if r.StatusCode >= 400 {
-		return 0, fmt.Errorf("%s: %s", fileUrl, r.Status)
+		return fmt.Errorf("%s: %s", fileUrl, r.Status)
 	}
 
 	var (
 		m int
-		n int64
 	)
 	buf := make([]byte, 64*1024)
 
 	for {
 		m, err = r.Body.Read(buf)
 		fn(buf[:m])
-		n += int64(m)
 		if err == io.EOF {
-			return n, nil
+			return nil
 		}
 		if err != nil {
-			return n, err
+			return err
 		}
 	}
 
 }
 
+func readEncryptedUrl(fileUrl string, cipherKey []byte, offset int64, size int, fn func(data []byte)) error {
+	encryptedData, err := Get(fileUrl)
+	if err != nil {
+		return fmt.Errorf("fetch %s: %v", fileUrl, err)
+	}
+	decryptedData, err := Decrypt(encryptedData, CipherKey(cipherKey))
+	if err != nil {
+		return fmt.Errorf("decrypt %s: %v", fileUrl, err)
+	}
+	if len(decryptedData) < int(offset)+size {
+		return fmt.Errorf("read decrypted %s size %d [%d, %d)", fileUrl, len(decryptedData), offset, int(offset)+size)
+	}
+	fn(decryptedData[int(offset) : int(offset)+size])
+	return nil
+}
+
 func ReadUrlAsReaderCloser(fileUrl string, rangeHeader string) (io.ReadCloser, error) {
 
 	req, err := http.NewRequest("GET", fileUrl, nil)