# angstromCTF (Write-up)
[TOC]

[官網網址](https://2023.angstromctf.com/)

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## Misc
### meow

### sanity check
在 DC misc 頻道中寫道

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## Web
### catch me if you can

### shortcircuit
在 F12 裡面我們找到這一行，一看就跟 flag 有關

根據 swap 的程式可以知道， 傳到 swap 的 array 有 4 個 elements，而且 chunk 只是把 flag 每 30 個字元切成一段，總共切了四段

所以重新排列一下 flag 就出來了 (自己排啦

### directory
找到要吐了，用 python 去跑，跑有夠久的 ==

import requests
from bs4 import BeautifulSoup

url = 'https://directory.web.actf.co/'

with open('output.txt','w') as f:

    for i in range(0,5000):
        web = url + str(i) + '.html'
        res = requests.get(web)
        soup = BeautifulSoup(res.text, "html.parser")
        f.write(str(soup)+'\n')
        if soup.text != 'your flag is in another file':
            print('I find it!'+soup.text)
            break
        elif i%100==0:
            print("I still alive! "+str(i))
print("finish!\n")
f.close()

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## Crypto

### ranch

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## rev
### checkers