TryHackMe recollections

Foreword Second CTF from NUS Greyhats. Initially I do not have any intention of writing writeups as the time for the CTF is only a day, so the following writeups are based on my recollection of the event. The web challenges done are gone, as there is no file stored. Challenges AmongUs This is a challenge involving image steganography. Not so difficult if you know the proper tooling for the challenge.

Foreword First ever CTF. Managed to solve a few challenges and learnt a ton! Challenges Baby The message is encrypted using the textbook RSA algorithm, and to decrypt the message we need to retrieve the values of the two primes p and q. We know the value of $r \times p - s \times q$, let the value be a. We have this observation that $r > s$, and $a < 0$, hence $p < q$.

About This is from a video by Reconless: https://www.youtube.com/watch?v=0-sA_kAVw74. The links below will be for my reference if I decided to revisit this concept later. I hope this attack vector is not dead now, but cool to know this existed regardless. Researches RPO whitepaper RPO Gadgets