[b01lers2020]Scrambled

解题步骤

脑洞题，cookie可疑

其中：Set-Cookie: transmissions=kxkxkxkxsh5c32kxkxkxkxsh;
刷新了几次，其中间内容变动，左右两侧kxkxkxkxsh均无变动，可疑点研究了很久，没有思路
查看了大佬wp：[b01lers2020]Scrambled(python脚本编写)得到了其代表的意思
例如：
5c32表示flag第32位是c，而它的前一位为5
cd26表示flag第26位是d，而它的前一位为c
等等……
https://blog.csdn.net/weixin_44037296/article/details/112549815

贴一个脚本：

from time import sleep

import requests as rq
import re, urllib

flag = ['_'] * 42
url = "http://a29923a2-e259-4c37-b908-d3ee00da3137.node4.buuoj.cn:81/"
cookies = {"frequency":"1","transmissions":"x"}

while True:
    res = rq.get(url, cookies=cookies)
    if res.status_code != 200:
        sleep(1)
        res = rq.get(url, cookies=cookies)
    cookie = res.headers["Set-Cookie"].split(';')[3].split('=')[2].replace("kxkxkxkxsh","")
    cookie = urllib.parse.unquote(cookie)

    if len(cookie) == 4:
        index = int(cookie[-2:])
    else:
        index = int(cookie[-1])
    flag[index] = cookie[0]
    flag[index + 1] = cookie[1]

    print(''.join(flag))
    if '_' not in flag:
        break