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A CAPTCHA is a type of challenge-response test used incomputing 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
For over a decade almost all online agreements, registrations, and confirmations have ended with a short annoying quiz to prove our humanity from or robot counterpart. Recently concert ticket monster Ticket Master decided to drop the Internet testing standard for a new puzzle.
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