diff --git a/2-7-diy7.py b/2-7-diy7.py
new file mode 100644
index 0000000..3ea36dd
--- /dev/null
+++ b/2-7-diy7.py
@@ -0,0 +1,21 @@
+import random
+
+# 私钥
+key = "abcdefgh使用python实现简单的位移替换加密，制作密码机关真是太好玩了哈哈哈！"
+# 要加密语句
+message = input("请输入：")
+# 最终加密后的语句
+key_message = ""
+# 干扰字符
+noise = "port:@#$%^&"
+for i in message:
+    str1 = i
+    str2 = random.choice(key)
+    str3 = random.choice(key)
+    text = str1+str2+str3
+    key_message = key_message + text
+list_message = list(key_message)
+index = random.randint(0,len(key_message))
+list_message.insert(index,noise)
+result_message =   "",join(list_message)
+print(result_message)
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