As I’ve always been interested in cryptography and cybersecurity, I started working on it a bit while at Hacker School, mainly by working on the challenges in the Microcorruption capture the flag game.
Today, thanks to Filippo (also the guy behind the extremely popular and valuable Heartbleed vulnerability tester), I ran across the Matasano Crypto Challenges, a series of challenges that looks similar in nature to Capture the Flag.
If you’re at all interested in doing this as well, let me know. Looks like a lot of fun.