Legit-captcha-entry-9240986

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As CAPTCHA (an acronym for "completely automated public Turing test to tell Computers and People Out"), a registered trademark of Carnegie Mellon University, 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. The type of CAPTCHA requires that the user type the letters in the image position, sometimes with the addition of a state sequence of letters or digits that appear on the screen. Because the test is run by computer, in contrast to the standard Turing test, run by a man, CAPTCHA is sometimes described as a reverse Turing test. This term is ambiguous because it could also mean a Turing test in which both participants are trying to prove that he is on the computer.
[http://legit-captcha-entry-sites.blogspot.com/ legit captcha sites]
From the earliest days of the Internet, users wanted to make the text unreadable on computers. The early people were hackers, posting about sensitive issues for online forums thought he was looking for keywords. To avoid such filters, replacing words with similar characters. Hello may be | - | 3 | _ |. _ () OR) - (£ 3 £ 0, and many other changes, so could not possibly detect filter all this later became known as leetspeak.

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