Matasano Crypto Challenges

Anyone done these before? Looks like fun, just sent the request e-mail. I'll try to report back!

We've built a collection of 48 exercises that demonstrate attacks on real-world crypto.

This is a different way to learn about crypto than taking a class or reading a book. We give you problems to solve. They're derived from weaknesses in real-world systems and modern cryptographic constructions. We give you enough info to learn about the underlying crypto concepts yourself. When you're finished, you'll not only have learned a good deal about how cryptosystems are built, but you'll also understand how they're attacked.
http://www.matasano.com/articles/crypto-challenges/

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I kind of like that, makes it more of a real challenge. If other people here do them too then it wouldn't be too hard to discuss without giving anything away. Some more info on how it works here: https://blog.pinboard.in/2013/04/the_matasano_crypto_challenges/

Also of interest is their research page (http://www.matasano.com/research/). Lots of pretty neat stuff.