Cryptofilter: My daughter is at summer camp and I can snail mail her or I can send email that will be printed out and delivered. The email is fast but readable by whoever prints/delivers the paper etc. Looking for a cipher that would be easy to learn and use... [more inside]
posted by kaytrem on Aug 8, 2006 - 21 answers

Does anyone have a simple, reasonably fair, method for generating random numbers in their head (or with pen and paper)? [more inside]
posted by andrew cooke on Jun 24, 2005 - 16 answers

Given a couple of encrypted hash strings, I need to identify the algorithm used to generate the hashes so that I can brute-force decrypt them. More inside.. [more inside]
posted by mrbill on Jun 16, 2004 - 16 answers