diff --git a/diy4.py b/diy4.py
new file mode 100644
index 0000000..afff72a
--- /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 = input("语句")
+
+# 请使用私钥key，对message进行加密
+key_message=""
+q="!@#$%^&*"
+for i in message:
+    str1=i
+    str2=random.choice(key)
+    str3=random.choice(key)
+    text=str1+str2+str3
+    key_message=key_message+text
+a=list(key_message)
+n=random.randint(0,len(a) )
+a.insert(n,q)
+a="".join(a)
+print(a)
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