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. The term was coined in 2000 by Luis von Ahn, Manuel Blum, Nicholas J. Hopper of Carnegie Mellon University and John Langford of IBM. The most common type of CAPTCHA was first invented by Mark D. Lillibridge, Martin Abadi, Krishna Bharat and Andrei Z. Broder. 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. This term is ambiguous because it could also mean a Turing test in which the participants are both attempting to prove they are the computer.
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In History Today : Birthday of P. V. Narasimha Rao, the 9th Prime Minister of India ( 28 June 1921 )
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Sony’s Morpheus virtual reality helmet set for 2016 launch Published on Mar 4, 2015 Sony has revealed an upgraded version of its virtual reality helmet, which it says it plans to put on sale in 2016. The new edition of Project Morpheus now features an OLED display, rather than an LCD one, letting it show […]