Captcha
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Revision as of 14:05, 15 July 2014 by Mib boby (Talk | contribs) (Created page with "A '''CAPTCHA''' (an acronym for "'''C'''ompletely '''A'''utomated '''P'''ublic '''T'''uring test to tell '''C'''omputers and '''H'''umans '''A'''part") is a type of challenge-...")
A CAPTCHA (an acronym for "Completely Automated Public Turing test to tell Computers and Humans Apart") is a type of challenge-response test used in computing to determine whether or not the user is human. This form of CAPTCHA requires that the user type the letters of a distorted image, sometimes with the addition of an obscured sequence of letters or digits that appears on the screen. Because the test is administered by a computer, in contrast to the standard Turing test that is administered by a human, a CAPTCHA is sometimes described as a reverse Turing test.
