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+ | ====== Audio Captcha ====== | ||
+ | ===== References ===== | ||
+ | * Luis von Ahn, Benjamin Maurer, Colin McMillen, David Abraham, Manuel Blum. " | ||
+ | * Inaccessibility of CAPTCHA, Alternatives to Visual Turing Tests on the Web, W3C Working Group Note 23 November 2005. http:// | ||
+ | * Jennifer Tam, Jiri Simsa, Sean Hyde, Luis Von Ahn: " | ||
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+ | ===== Introduction ===== | ||
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+ | CAPTCHAs (Completely Automated Public Turing test to tell Computers and Humans Apart) are popular security techniques on the World Wide Web that prevent automated programs from abusing online services. | ||
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+ | A typical CAPTCHA is an image containing several distorted characters that appears at the Web forms. | ||
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+ | Users are asked to type the distorted dirty characters to let the system know that they are human. | ||
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+ | Image-based CAPTCHAs are, however, preventing Web use of persons with visual disability. |