Building a better spam-blocking CAPTCHA
Date: February 18, 2009Source: COMPUTERWORLD
CAPTCHA's idea is simple enough. It presents users with an image showing an obfuscated string of letters that they must type in to get an e-mail or social networking account, for instance, or to enter a comment on an online forum. The theory is that only humans can decipher the letters hidden in the image and type in the correct code, and for a time it was an effective tool to keep the bots out.
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