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    EUROCRYPT
    2003
    Springer
    177views Cryptology» more  EUROCRYPT 2003»
    CAPTCHA: Using Hard AI Problems for Security
    13 years 10 months ago
    CAPTCHA: Using Hard AI Problems for Security
    Download  www.captcha.net
    We introduce captcha, an automated test that humans can pass, but current computer programs can’t pass: any program that has high success over a captcha can be used to solve an u...
    Luis von Ahn, Manuel Blum, Nicholas J. Hopper, Joh...
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