diff --git a/diy4.py b/diy4.py
new file mode 100644
index 0000000..e383de9
--- /dev/null
+++ b/diy4.py
@@ -0,0 +1,16 @@
+import random
+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！"
+message = "诺依，周末一起去看动漫展吧！"
+key_message=""
+noise="port:@#$%^&"
+for i in message:
+    str1=i
+    str2=random.choice(key)
+    str3=random.choice(key)
+    text=str1+str2+str3
+    key_message=key_message+text
+list_message=list(key_message)
+index=random.randint(0,len(key_message))
+list_message.insert(index,noise)
+result_message="".join(list_message)
+print(result_message)
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