diff --git a/diy4.py b/diy4.py
new file mode 100644
index 0000000..3354319
--- /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 = input()
+key_message="" 
+j="port:@#$%^&"
+# 请使用私钥key，对message进行加密
+for i in message:
+    a=i
+    b=random.choice(key)
+    c=random.choice(key)
+    key_message+=a+b+c
+#print(key_message)
+b=list(key_message)
+m=random.randint(0,len(key_message))
+b.insert(m,j)
+n="".join(b)
+print(n)
\ No newline at end of file