Monthly Archives February 2017

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: A senior technical manager of a fridge manufacturer demanded the…

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…

Quick challenge for a quick 250 points. So hopefully a quick writeup! Here's the clue: Our guy inside e-corp was able to get that packet capture of their backend PKI you asked for. Unfortunately it seems they're using TLS to protect the modulus fetch. Now, I have been told that the best crackers in the world can do this in…

HackIM time again. This year seemed slightly better organized than last year. Some nice challenges. I don't think this challenge was worth 350 points but I'll document my solution anyway in sort of a "what not to do" when making a crypto challenge. Here's the clue including the image they gave as a description: Breaking Bad Key Exchange Hint 1…

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