reCAPTCHA: Blocking Spam and More
Aug 17, 2009 by Jon KarnaA few months ago, I developed a ColdFusion/Mach-II implementation of the reCAPTCHA API. This type of CAPTCHA requires the person to enter two words rather than a single sequence of random letters. In addition to protecting your website from spam, reCAPTCHA helps digitize text books. They do this by using a mystery word as one of the two words, until there is a consensus about what the correct answer for that word is.
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