The top documents tagged [effectiveness of captchas]

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563.10.3 captcha

563.10.3 captcha

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563.10.3 CAPTCHA Presented by: Sari Louis SPAM Group: Marc Gagnon, Sari Louis, Steve White University of Illinois Spring 2006.

563.10.3 CAPTCHA Presented by: Sari Louis SPAM Group: Marc Gagnon, Sari Louis, Steve White University of Illinois Spring 2006.

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