diff --git a/diy4.py b/diy4.py
new file mode 100644
index 0000000..97f1f59
--- /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 
+s="gftysrdtsfytaftsz"
+message = "诺依，周末一起去看动漫展吧！"
+a=""
+for i in message:
+    str1=i
+    str2=random.choice(key)
+    str3=random.choice(key)
+    sans=str1+str2+str3
+    a=a+sans
+c=list(a)
+c.insert(random.randint(1,len(c)),s)
+k="".join(c)
+print(k) 
+# 请使用私钥key，对message进行加密
+
+