I agree. There are whole classes of problems that are not at all obvious until one has spent time learning how to break bad crypto. Matasano's challenges[0] (wh

I agree. There are whole classes of problems that are not at all obvious until one has spent time learning how to break bad crypto. Matasano's challenges[0] (which I think tptacek helped create) are a good start. 0. http://cryptopals.com/ http://cryptopals.com/