Cryptography

Encryption, hashing, message authentication and more

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PRNG
HMAC
HMAC IN PHP DOESN'T PROPERLY FAIL LEADING TO A SERIOUS BUG
This short php code contains a critical vulnerability. In this video I will explain in detail what I think while analysing it.
by LiveOverflow
CTF Web Vulnerabilities Web PHP Code Audit/Review
BASIC WINDOWS REVERSING AND ATTACKING WEAK CRYPTO
This challenge was part of the FLARE-On 2018 CTF. In this video we reverse engineer a basic windows .exe to find out how to win the game. At first we tried to attack the weak crypto but failed. At the end it turns out I had a bug in my code :(
by LiveOverflow
CTF JD-Gui ILSpy Java PRNG

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