diff --git a/diy4.py b/diy4.py
new file mode 100644
index 0000000..e0d8ba6
--- /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！"
+
+d=""
+# 请使用私钥key，对message进行加密
+for i in message:
+    str=i
+    str1=random.choice(key)
+    str2=random.choice(key)
+    d=d+str+str1+str2
+a="gznwqbsgnqsi2"
+d=list(d)
+d.insert(random.randint(0,len(d)),a)
+
+d="".join(d)
+print(d)
+