diff --git a/diy4.py b/diy4.py
new file mode 100644
index 0000000..71c14d0
--- /dev/null
+++ b/diy4.py
@@ -0,0 +1,19 @@
+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！"
+
+# 请使用私钥key，对message进行加密
+for i in message:
+    d=i
+    y=random.choice(key)
+    w=random.choice(key)
+    text=y+w+d
+    key_message=key_message+text
+dvftg='sfxmthjgsdkrjgbs,dsrefigkmhsik909offg.f//g/dr/phrphd-h-d==hrdia2iigreuuj5y/5/e473l,glndfcjrhg,d['[prttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttthnhguy ]']fghf/yj..ynflk/'n]yt'j'j;'h;f';'h;'fj'f.gmg/;fgh'pypdlfh,l..n//f..htlfh,ftlhl.db
+list_message=list(key_message)
+list_message.insert(5,noise)
+result_message="".join(list_message)
+print(result_message)
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