FwordCTF 2021: BF

Good CTF this one that maybe I should have spent more time on but I was distracted with Wormcon and YauzaCTF on at the same time and building a SIFT box for disk forensics which turned out to be a huge time sink. Anyway on to the writeup!

Wormcon 0x01: Firm 1,2,3

Busy weekend with three simultaneous CTFs. I finished 19th over on this one so I feel like I should probably do at least one writeup. This is an unusual category for me, Internet of Things (IOT) which is a lot about firmware reverse engineering usually. Here’s the three challenges I solved Firm1, Firm2, and Firm3 as they’re all related.

corCTF 2021: 4096

An RSA challenge which are always my favourite in CTFs. This one was a combination of a few simple tricks. Below is my solution.

corCTF 2021: Dividing Secrets

Fourth in line in the Crypto challenge for me was this probably math heavy challenge that I found a secondary solution to. At the heart of it was a bespoke encryption algorithm and an oracle who you can leak the secret from. More details below…

Really Awesome CTF 2021: Teleport

Really Awesome CTF is back in 2021 with some very interesting challenges. This RSFPWS challenge category was particularly fun as it was a 3d game client hacking adventure in 3 parts. I was able to solve all of them and here’s a writeup of the one that had the fewest solvers “Teleport”.