diff --git a/9.6.md b/9.6.md
index 124c626c..c506d8d1 100644
--- a/9.6.md
+++ b/9.6.md
@@ -11,23 +11,17 @@
 		"fmt"
 	)
 
-	const (
-		base64Table = "123QRSTUabcdVWXYZHijKLAWDCABDstEFGuvwxyzGHIJklmnopqr234560178912"
-	)
-
-	var coder = base64.NewEncoding(base64Table)
-
 	func base64Encode(src []byte) []byte {
-		return []byte(coder.EncodeToString(src))
+		return []byte(base64.StdEncoding.EncodeToString(src))
 	}
 
 	func base64Decode(src []byte) ([]byte, error) {
-		return coder.DecodeString(string(src))
+		return base64.StdEncoding.DecodeString(string(src))
 	}
 
 	func main() {
 		// encode	
-		hello := "hello world"
+		hello := "你好，世界！ hello world"
 		debyte := base64Encode([]byte(hello))
 		fmt.Println(debyte)
 		// decode	
@@ -43,6 +37,7 @@
 		fmt.Println(string(enbyte))
 	}
 
+
 ## 高级加解密
 
 Go语言的`crypto`里面支持对称加密的高级加解密包有：
@@ -92,7 +87,7 @@ Go语言的`crypto`里面支持对称加密的高级加解密包有：
 		cfb.XORKeyStream(ciphertext, plaintext)
 		fmt.Printf("%s=>%x\n", plaintext, ciphertext)
 
-		// 加密字符串
+		// 解密字符串
 		cfbdec := cipher.NewCFBDecrypter(c, commonIV)
 		plaintextCopy := make([]byte, len(plaintext))
 		cfbdec.XORKeyStream(plaintextCopy, ciphertext)