diff --git a/diy4.py b/diy4.py
new file mode 100644
index 0000000..9396614
--- /dev/null
+++ b/diy4.py
@@ -0,0 +1,19 @@
+import random
+
+# 私钥
+key = "u也该的方法对付三个研讨会r研讨会r人复合函数"
+# 要加密语句
+message = "诺依，周末一起去看动漫展吧！"
+key_message="" 
+# 请使用私钥key，对message进行加密
+for i in message:
+    a=i
+    n=random.choice(key)
+    c=random.choice(key)
+    text=a+n+c
+    key_message=key_message+text
+print(key_message)
+message1=list(key_message)
+message1.insert(random.randint(0,len(message1)),"1145514")
+message2="".join(message1)
+print(message2)
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