diff --git a/diy4.py b/diy4.py
new file mode 100644
index 0000000..2e27010
--- /dev/null
+++ b/diy4.py
@@ -0,0 +1,23 @@
+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
+x=input("请输入要加密的文字:")
+message = x
+key_message=""
+# 请使用私钥key，对message进行加密
+noise="port:@#$%^&"
+index=random.randint(0,14)
+for i in message:
+    a=i
+    b=random.choice(key)
+    c=random.choice(key)
+    text=a+b+c
+    key_message=key_message+text
+
+list_message=list(key_message)
+list_message.insert(index,noise)
+i="".join(list_message)
+print(i)