diff --git a/main.go b/main.go
index 4e8e0e6..8317acb 100644
--- a/main.go
+++ b/main.go
@@ -9,11 +9,13 @@ import (
   "io"
   "io/ioutil"
   "os"
+  "regexp"
   "syscall"
   "golang.org/x/crypto/ssh/terminal"
 )
 
 var debug bool = false
+var FileName string
 
 func checkErr(err error) {
   if err != nil {
@@ -69,6 +71,11 @@ func data2file(filename string, data []byte) {
 
 func getMode() string {
   var mode string
+  //fmt.Printf("from getMode, fn = %s \n",FileName)
+  match, _ := regexp.Match(`.*\.hdn$`,[]byte(FileName))
+  if match {
+    return "s"
+  }
   fmt.Print("mode: ")
   fmt.Fscan(os.Stdin, &mode)
   if mode == "q" {os.Exit(1)}
@@ -120,7 +127,8 @@ func checkPass() string {
 }
 
 func main() {
-  fn := readFn()
+  FileName = readFn()
+  fn := FileName
   fmt.Println(fn)
   mode := getMode()
   switch mode {
@@ -130,6 +138,9 @@ func main() {
       data := file2data(fn)
       secret := encrypt(data,key)
       secretfn := fn + ".hdn"
+      clearfn := fn + ".origin"
+      err := os.Rename(fn,clearfn)
+      checkErr(err)
       data2file(secretfn,secret)
     case "s":
       fmt.Print("password: ")