diff --git a/tscipher/xor.go b/tscipher/xor.go
index 19e9dcb..e34efab 100644
--- a/tscipher/xor.go
+++ b/tscipher/xor.go
@@ -9,7 +9,7 @@ type XOR struct {
 func (this *XOR) Decrypt(data []byte) (decrypted []byte, err error) {
 	decrypted = make([]byte, len(data))
 	for i := 0; i < len(data); i++ {
-		decrypted[i] = data[i] ^ this.key[i%len(this.key)]
+		decrypted[i] = data[len(data)-i-1] ^ this.key[i%len(this.key)]
 	}
 	err = nil
 	return
@@ -18,7 +18,7 @@ func (this *XOR) Decrypt(data []byte) (decrypted []byte, err error) {
 func (this *XOR) Encrypt(data []byte) (encryped []byte, err error) {
 	encryped = make([]byte, len(data))
 	for i := 0; i < len(data); i++ {
-		encryped[i] = data[i] ^ this.key[i%len(this.key)]
+		encryped[i] = data[len(data)-i-1] ^ this.key[i%len(this.key)]
 	}
 	err = nil
 	return