diff --git a/diy4.py b/diy4.py
new file mode 100644
index 0000000..cad2aad
--- /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！"
+message_t=""
+# 请使用私钥key，对message进行加密
+b="ucxwdcddkdwjxxa43546754y53745/..mj.l.'p,].p/.'p/[.'[,ol/p.[/]]']8ur854t94253109ir1rr104=4390449309fugfjmcpifdvmkfvn ie cenj8cw0[9ug0tqpdhfr09w8terp32qfi32urf2[ig3u2qchofyrep]]"
+
+for i in message:
+    str1=random.choice(key)
+    str2=random.choice(key)
+    text=i+str1+str2
+    message_t=message_t+text
+print(message_t)
+a=list(message_t)
+a.insert(3,b)
+print(a)
+message1="".join(a)
+print(message1)