题目地址：http://ctf5.shiyanbar.com/web/web200.jpg
一道自编加密函数的题目，只要写个逆向解密的脚本就好了，贴上脚本
$str = "a1zLbgQsCESEIqRLwuQAyMwLyq2L5VwBxqGA3RQAyumZ0tmMvSGM2ZwB4tws";
$str = str_rot13($str);
$str = strrev($str);
$str = base64_decode($str);
$result = '';
for ($i = 0;$i < strlen($str);$i++){
$temp = substr($str,$i,1);
$get = ord($temp) - 1;
$temp = chr($get);
$result = $result . $temp;
}
$result = strrev($result);
echo $result;
运行
getflag
the end
