diff --git a/diy4.py b/diy4.py
new file mode 100644
index 0000000..8207ea7
--- /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！"
+h="port:@#$%^&"
+# 请使用私钥key，对message进行加密
+e=""
+for i in message:
+    a=i
+    b=random.choice(key)
+    c=random.choice(key)
+    d=b+a+c
+    e=e+d
+f=list(e)
+j=random.randint(0,len(h))
+f.insert(j,h)
+g="".join(f)
+print(g)
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