an exercise in miscellany

CAPTCHA

In technology & innovatons, words & phrases on January 19, 2011 at 12:09 pm

A CAPTCHA is a type of challenge-response test to ensure that the response is not generated by a computer. Because other computers are unable to solve the CAPTCHA, any user entering a correct solution is presumed to be human. Thus, it is sometimes described as a reverse Turing test, because it is administered by a machine and targeted to a human. The term “CAPTCHA” based upon the word capture was coined in 2000 by Luis von Ahn, Manuel Blum, Nicholas J. Hopper, and John Langford all of Carnegie Mellon University. It is a contrived acronym for “Completely Automated Public Turing test to tell Computers and Humans Apart”

via CAPTCHA – Wikipedia

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