All about CAPTCHA's. Decoding CAPTCHA's for Fun and Profit

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 anecdotes.

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