| Document Date: 2003-02-27 12:07:03
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Company IBM / Yahoo! / Altavista / Microsoft / / Country United States / / Currency pence / USD / / Facility Carnegie Mellon University / / IndustryTerm text-generation algorithm / plausible solution / similar systems / online poll / cryptographic protocols / stateof-the-art algorithms / respect web pages / online polls / search engines / online poll asking / password systems / text-generation algorithms / reason algorithms / computing / free email services / distinction here because in some applications / cryptographic protocol / search engine bots / / Organization MIT / Carnegie Mellon University / Pittsburgh PA / / Product Pentax K-x Digital Camera / Sony Ericsson P1i Smartphone / / PublishedMedium Communications of the ACM / / Technology encryption / cryptography / OCR / machine vision / artificial intelligence / stateof-the-art algorithms / text-generation algorithms / cryptographic protocol / Search Engine / reason algorithms / Optical Character Recognition / html / cryptographic protocols / text-generation algorithm / / URL www.spamarrest.com / www.captcha.net / /
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CAPTCHA: Using Hard AI Problems For Security Luis von Ahn1 , Manuel Blum1 , Nicholas J. Hopper1 , and John Langford2 1 Computer Science Dept., Carnegie Mellon University, Pittsburgh PA 15213, USA