First part of a long series of well thought out challenges in the RHme2 CTF. This one was the “introduction” one but it was tricky and certainly worth the 400 points I feel. Here’s my approach which I believe is different to how some others solved it. First, the clue:

Riscure RHme2 is finally over! What a marathon CTF. I actually spent a tonne of time on this CTF over the past few months, mainly because I had never looked at embedded hardware systems in the past. So I had to gain my skills from never having even used Arduino to performing side channel analysis and fault injection, reverse engineering 8 bit microcontroller binaries, and dealing with ever increasing lust for more and better hardware hacking tools!

Quick write-up because this first part of the RSA challenges at BKP this year was trivial. Writing up mostly as a way to show how automation can help you a lot when solving CTF challenges. Even on the level of Boston Key Party which, as I re-remembered this week, is a pretty damn hard CTF.

The second mobile reversing challenge of BSides SF CTF. Slightly harder than the first but only just. Here’s the clue and APK:

Quick challenge for a quick 250 points. So hopefully a quick writeup! Here’s the clue: