diff --git a/diy4.py b/diy4.py
new file mode 100644
index 0000000..38b2c2c
--- /dev/null
+++ b/diy4.py
@@ -0,0 +1,19 @@
+import random
+key = ["abcdefgh使用python实现简单的位移替换加密,制作密码机关真是太好玩了哈哈哈!"]
+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.randdint(0,len(key_message))
+list_message.insert(index,noise)
+
+result_message = "",join(list_message)
+print(result_message)
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