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Warmup
Securinets-CTF-2019(Warmup, 960 pt) On excuting the given binary asked for passcode and passcode is the flag which we have to recover it. Now lets dive on the chall . On decompiling binary in ida we can see our flag input is passed in a function which is like this: _int64...
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Matrix of Hell
Securinets-CTF-2019(Matrix of Hell, 992 pt) An ELF stripped binary is provided. On running binary, it asked for a password which we have to find. It is more like crackme’s problems. So i opened it in my ida to do some static analysis. Renamed variables for easy understanding. There are main...
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AES-CBC bit flipping Attack
n00b19CTF(Easy-Flipp, 100 pt) This is simple crypto challenge created by me. At the time of CTF, this challenge had zero solved. So, I thought to write a writeup for beginners to understand how CBC bit flipping works. AES-CBC Encryption and Decryption flow chart The main vulnerable part of CBC is...