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    Ian Calvert
    @IanCal
    if you like the crypto stuff, these challenges are excellent http://cryptopals.com/
    they've been running it for a while now, used to be purely email based but they're building a site around it now
    that I can recommend wholeheartedly
    Ali
    @Najaf
    I was about to post the link to cryptopals.com, if that doesn't put you off doing crypto forever, nothing will.
    Ali
    @Najaf