diff --git a/diy4.py b/diy4.py
new file mode 100644
index 0000000..a6a9833
--- /dev/null
+++ b/diy4.py
@@ -0,0 +1,22 @@
+import random
+keypop1="你个国粹"
+keypop2="卢逸航是个国粹"
+keypop3="恭喜你，喜提被绿"
+# 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=""
+for i in message:   
+    str1=i
+    str2=random.choice(key)
+    str3=random.choice(key)
+    text=str1+str2+str3
+    key_message=key_message+text
+li_message=list(key_message)
+li_message.insert(random.randint(8,12),keypop1)
+li_message.insert(random.randint(10,14),keypop2)
+li_message.insert(random.randint(5,13),keypop3)
+a="".join(li_message)
+print(a)
+# 请使用私钥key，对message进行加密