On: You are dangerously bad at cryptography

[alinajaf]

Author here. A good place to start (mentioned in the article).

http://www.matasano.com/articles/crypto-challenges/

Never met any of them in real life, but they seem like good people to me. I've actually used knowledge I picked up from those exercises to fix vulnerabilities in past clients code, and I'm not yet half-way through them.