diff --git a/backend/service/setting.go b/backend/service/setting.go
index eaf1f6e..34ce0b4 100644
--- a/backend/service/setting.go
+++ b/backend/service/setting.go
@@ -18,7 +18,7 @@ var defaultValueMap = map[string]string{
 	"webListen":     "",
 	"webDomain":     "",
 	"webPort":       "2095",
-	"webSecret":     common.Random(32),
+	"secret":        common.Random(32),
 	"webCertFile":   "",
 	"webKeyFile":    "",
 	"webPath":       "/app/",
@@ -191,11 +191,11 @@ func (s *SettingService) SetWebPath(webPath string) error {
 }
 
 func (s *SettingService) GetSecret() ([]byte, error) {
-	secret, err := s.getString("webSecret")
-	if secret == defaultValueMap["webSecret"] {
-		err := s.saveSetting("webSecret", secret)
+	secret, err := s.getString("secret")
+	if secret == defaultValueMap["secret"] {
+		err := s.saveSetting("secret", secret)
 		if err != nil {
-			logger.Warning("save webSecret failed:", err)
+			logger.Warning("save secret failed:", err)
 		}
 	}
 	return []byte(secret), err
diff --git a/backend/util/common/random.go b/backend/util/common/random.go
index b475716..b6cea34 100644
--- a/backend/util/common/random.go
+++ b/backend/util/common/random.go
@@ -1,13 +1,26 @@
 package common
 
-import "math/rand"
+import (
+	"math/rand"
+	"time"
+)
 
-var allSeq [62]rune
+var (
+	allSeq []rune
+	rnd    = rand.New(rand.NewSource(time.Now().UnixNano()))
+)
+
+func init() {
+	chars := "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"
+	for _, char := range chars {
+		allSeq = append(allSeq, char)
+	}
+}
 
 func Random(n int) string {
 	runes := make([]rune, n)
 	for i := 0; i < n; i++ {
-		runes[i] = allSeq[rand.Intn(len(allSeq))]
+		runes[i] = allSeq[rnd.Intn(len(allSeq))]
 	}
 	return string(runes)
 }