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People should really be saying "If you roll your own crypto, and then use it, expecting to stay secure against GCHQ and NSA, then you're an idiot".

But rolling your own crypto, then attacking it, is probably a good learning exercise. Having a group of people rolling their own crypto, and then attacking each other's attempts is probably better.

Somewhere there's a list of common mistakes people make, and it's surprising how often those mistakes are found in commercial "MILITARY GRADE ENCRYPTION!"

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