diff --git a/diy4.py b/diy4.py
new file mode 100644
index 0000000..9a3f0db
--- /dev/null
+++ b/diy4.py
@@ -0,0 +1,24 @@
+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=""
+sb="herwkfh9911991177887788yntp;lkjiut9okjuti过的很快识论和古人gyihjjgrjhu任佑宸在香港热死"
+# 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)
+    d=a+b+c
+    key_message=key_message+d
+print(key_message)
+list_message=list(key_message)
+q=random.randint(0,len(key_message))
+list_message.insert(q,sb)
+list_message.insert(5,sb)
+r_message="".join(list_message)
+print(r_message)
+
+