The acronym was coined in the year 2000 by Luis von Ahn, Manuel Blum, Nicholas Hopper and John Langford in a paper they published at Carnegie Mellon University. CAPTCHA stands for Completely Automated Public Turing Test To Tell Computers and Humans Apart. How does it know you are a human? One clue is in the name on the right side of the box. ![]() ![]() If you spend any time on the internet, you’ve probably run into a box like the one below asking to confirm that you are not a robot.
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