diff --git a/diy4.py b/diy4.py
new file mode 100644
index 0000000..550dd4f
--- /dev/null
+++ b/diy4.py
@@ -0,0 +1,21 @@
+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 = "诺依，周末一起去看动漫展吧！"
+key_message=""
+noise="pop:@#$%^&"
+# 请使用私钥key，对message进行加密
+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)#字符串转换为列表
+index=random.randint(0,len(key_message))
+list_message.insert(index,noise)
+result_message="".join(list_message)# "".join()将列表内容转换为字符串
+print(result_message)