diff --git a/utils/encrypted.go b/utils/encrypted.go
index 81fbd17..24034eb 100644
--- a/utils/encrypted.go
+++ b/utils/encrypted.go
@@ -17,28 +17,28 @@ func NewEncrypt(pubKey, privKey string) *Encrypt {
 	return &Encrypt{pubKey: pubKey, privKey: privKey}
 }
 
-func (e *Encrypt) EncryptStr(str string) (string, error) {
+func (e *Encrypt) EncryptStr(str string) ([]byte, error) {
 	block, _ := pem.Decode([]byte(e.pubKey))
 	if block == nil {
-		return "", errors.New("failed to parse PEM block containing the public key")
+		return nil, errors.New("failed to parse PEM block containing the public key")
 	}
 	pub, err := x509.ParsePKIXPublicKey(block.Bytes)
 	if err != nil {
-		return "", err
+		return nil, err
 	}
 	rsaPubKey, ok := pub.(*rsa.PublicKey)
 	if !ok {
-		return "", errors.New("failed to parse RSA public key")
+		return nil, errors.New("failed to parse RSA public key")
 	}
 
 	shifr, err := rsa.EncryptPKCS1v15(rand.Reader, rsaPubKey, []byte(str))
 	if err != nil {
-		return "", err
+		return nil, err
 	}
-	return string(shifr), nil
+	return shifr, nil
 }
 
-func (e *Encrypt) DecryptStr(shifr string) (string, error) {
+func (e *Encrypt) DecryptStr(shifr []byte) (string, error) {
 	block, _ := pem.Decode([]byte(e.privKey))
 	if block == nil {
 		return "", errors.New("failed to parse PEM block containing the private key")
@@ -49,7 +49,7 @@ func (e *Encrypt) DecryptStr(shifr string) (string, error) {
 		return "", err
 	}
 
-	res, err := rsa.DecryptPKCS1v15(rand.Reader, priv, []byte(shifr))
+	res, err := rsa.DecryptPKCS1v15(rand.Reader, priv, shifr)
 	if err != nil {
 		return "", err
 	}