This is my solution to the first 10 matasano crypto challenges - major spoilers in here for those that haven't done this
Questions can be found at http://cryptopals.com/sets/1
This is a project I haven't worked on since 2013 but I enjoyed it a lot and would like to go back to at some point. I did the first 8 questions when you had to email the matasano guys to get the questions and they would only give out 8 questions at a time.
When I submitted the answers to the first 8 I did not get a response for quite a few months and I haven't had too much opportunity to start these again