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<Beyond CAPTCHA: No Bots Allowed! ⁄ >




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I'm sure you've seen them many times -- those wild squiggles that need to be deciphered and typed into a text box before you can buy concert tickets online or access a comment form.

CAPTCHAs are generally one or two words presented as graphics, overlaid with some kind of distortion, and they function as a test that relies on your human ability to recognize them. CAPTCHA stands for "Completely Automated Public Turing test to tell Computers and Humans Apart." This is a misnomer, because a CAPTCHA isn't a Turing test -- but we'll come back to that later!



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http://www.sitepoint.com/article/captcha-problems-alternatives




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