Abstract:The CAPTCHA (Completely Automated Turing test to tell Computers and Humans Apart) is found throughout many websites. By challenging users to read a line of scrambled letters, identify crosswalks in an image, or some complete another task that is difficult for a computer to do, but comparatively trivial for a human user, a CAPTCHA verifies that the user is an actual human, and not software meant to interact maliciously with the website. This mundane and easily overlooked interface element is an important site w… Show more
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