code hacking, zen coding

HackYouToo CTF – Binary 300 – Shredder Write-up

HackYouToo CTF – Binary 300 – Shredder Write-up

Have you tried feeding critical documents to a shredder? We’ve accidentally done this very thing. Shredder: shredder.exe Document remains: broken_flag.jpg We need our document back! See: http://hackyou.ctf.su/tasks/shredder Shredder is a Win32 binary that encrypt source file “flag.jpg” to “broken_flag.jpg”. The encryption is only some translations and swaps and can be […]

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Hack.lu CTF – Python Jail Writeup

Hack.lu CTF – Python Jail Writeup

Challenge source code: #!/usr/bin/env python ”’ Running instructions.  sockets are insecure. We do not implement any socket behaviour in this  file.  Please make this file +x and run with socat:     socat TCP-LISTEN:45454,fork EXEC:./chal.py,pty,stderr Debugging:  Just execute chal.py and play on terminal, no need to run socat Note:  This […]

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HackYou CTF – Web 300 – RNG of Ultimate Security Writeup

HackYou CTF – Web 300 – RNG of Ultimate Security Writeup

Web challenge. We have the “source code” and we know the location of the flag: <!– can’t touch this: http://securerng.misteryou.ru/flag.txt.gz –> <!– can touch this: http://securerng.misteryou.ru/index.php.txt –> The web page is simple form to generate pseudo-random numbers. Here is the form:     <form method=’POST’>       Enter the […]

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