CAPTCHA | engleski leksikon

1. CAPTCHA

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(general term): In 2000, Luis von Ahn, Manuel Blum, and Nicholas J.Hopper, affiliates of Carnegie Mellon University, and IBM’s John Langford coined this term, which stands for “Completely Automated Public Turing test to tell Computers and Humans Apart.” The test, administered by a computer, is different from the original Turing test, which is typically administered by a human. It is a kind of challenge-response test whose purpose is to ascertain whether a particular user is a human. The test is frequently used to identify human users and block computerized applications when signing up for some forms of Internet accounts. An example of this use is to block spammers from automatically setting up email accounts with free, public email services. The test involves the recognition of a distorted image of letters, often with the inclusion of some obscure sequence of numbers or letters.

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