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The following post describes the way I solved the challenge Exam Solutions from the NorthSec 2020 CTF. A zip file containing two files was provided: SeverityHighProtector.zip [...]

In the last Northsec event, I had the chance to play with a fun audio challenge. I had never done an audio steganography challenge before, so maybe the way I did it may seem obvious for some, but [...]

This is the sixth and final part of the story of the smart card track at NSEC 2013. You can see the first five parts: part 1, part 2, part 3, part 4 and part 5. At the end of part 5, I had all [...]

This is the fifth part of the story of the smart card track at NSEC 2013. You can see the first four parts: part 1, part 2, part 3 and part 4. I had made good progress and I only needed one more [...]

This is the fourth part of the story of the smart card track at NSEC 2013. You can see the first three parts: part 1, part 2 and part 3. Now, I had 3 of the 5 unknown components required to [...]

This is the third part of the story of the smart card track at NSEC 2013. You can see the first two parts: part 1 and part 2. Now, I had found two flags and the next one was the Old encryption [...]

I want to post in this blog what I did at NorthSec 2013 which is a hacking competition that took place in Montreal in April 2013 (www.nsec.io). It is a 3 day event, so I’ll use multiple [...]