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  1. All about CAPTCHA's
    All about CAPTCHA's
    Decoding CAPTCHA's for Fun and Profit
    Ben E. C. Boyter

    Welcome to the practical guide to decoding CAPTCHA's. Everything you need to start decoding CAPTCHA's is contained within. Although there is a heavy emphasis on decoding you can consider it a general guide to CAPTCHA's in general. Although mostly focussed on algorithmic methods of decoding CAPTCHA's this will also briefly cover paid/human services, history and anechdotes.