diff --git a/2-7-diy2.py b/2-7-diy2.py
new file mode 100644
index 0000000..0189a8a
--- /dev/null
+++ b/2-7-diy2.py
@@ -0,0 +1,6 @@
+# 需要进行加密的语句
+message = "诺依，周末一起去看动漫展吧！"
+# 请对message进行遍历，取出所有元素
+for i in message:
+    print(i)
+    
\ No newline at end of file
diff --git a/diy2.py b/diy2.py
index 2bc971e..ec2e577 100644
--- a/diy2.py
+++ b/diy2.py
@@ -1,4 +1,6 @@
 message = "诺依，周末一起去看动漫展吧！"
-
+import random
 # 请对message进行遍历，取出所有元素
-
+key="信息加密好酷呀"
+str=random.choice(key)
+print(str)
\ No newline at end of file
diff --git a/diy4.py b/diy4.py
new file mode 100644
index 0000000..399265f
--- /dev/null
+++ b/diy4.py
@@ -0,0 +1,14 @@
+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！"
+text=''
+# 请使用私钥key，对message进行加密
+for i in message:
+    str1=i
+    str2=random.choice(key)
+    str3=random.choice(key)
+    str4=str1+str2+str3
+    print(text)