diff --git a/diy4.py b/diy4.py
new file mode 100644
index 0000000..30e79d9
--- /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 = "诺依，周末一起去看动漫展吧！"
+key_message = ""
+noise = 'apartment$#%&**@'
+# 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)
+index = random.randint(0,len(key_message))
+list_message.insert(index,noise)
+result_message = "".join(list_message)
+print(key_message)
\ No newline at end of file