diff --git a/diy4.py b/diy4.py
new file mode 100644
index 0000000..7dcba4a
--- /dev/null
+++ b/diy4.py
@@ -0,0 +1,20 @@
+import random
+
+# 私钥
+key = "abcdefgh使用编程实现位移替换加密，制作密码机关真是太好玩了哈哈！"
+# 要加密语句
+message = input("请输入:")
+key_message="" 
+# 请使用私钥key，对message进行加密
+noice = "port:@#$%^&*"
+for i in message:
+    a=i
+    b=random.choice(key)
+    c=random.choice(key)
+    d=a+b+c
+    key_message=key_message+d
+list_message = list(key_message)
+index = random.randint(0,len(key_message))
+list_message.insert(index,noice)
+result_message = "".join(list_message)
+print(result_message)
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