diff --git a/diy4.py b/diy4.py
new file mode 100644
index 0000000..2a12aa7
--- /dev/null
+++ b/diy4.py
@@ -0,0 +1,28 @@
+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！"
+
+bf=""
+# 请使用私钥key，对message进行加密
+redt="wtcadtfjcfyxgbftfcyg"
+for i in message:
+    me=i
+    UH=random.choice(key)
+    UH1=random.choice(key)
+    gdr=me+UH+UH1
+    bf=bf+gdr
+
+yug=list(bf)
+
+hg=random.randint(0,len(bf))
+yug.insert(hg,redt)
+
+
+
+erg=list(bf)
+erg.insert(5,redt)
+u="".join(erg)
+print(u)
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