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CAPTCHA
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== External links == {{Sister project links|d=Q484598|mw=CAPTCHA|voy=no|species=no|commons=Category:Captcha|v=no|q=no|n=no|s=no}} <!--Please, no implementations here β see discussion--> * [http://www.wisdom.weizmann.ac.il/~naor/PAPERS/human_abs.html Verification of a human in the loop, or Identification via the Turing Test], Moni Naor, 1996. * [http://www.w3.org/TR/turingtest/ Inaccessibility of CAPTCHA: Alternatives to Visual Turing Tests on the Web], a [[W3C]] Working Group Note. * [https://web.archive.org/web/20120205201803/http://www2.parc.com/istl/projects/captcha/history.htm CAPTCHA History] from [[PARC (company)|PARC]]. * [https://web.archive.org/web/20170915204258/https://pdfs.semanticscholar.org/692a/31f65e29ea3667de46933245f53bda55a65b.pdf Reverse Engineering CAPTCHAs] Abram Hindle, Michael W. Godfrey, Richard C. Holt, 2009-08-24 {{Authority control}} [[Category:Turing tests]] [[Category:Internet forum terminology]] [[Category:Computer vision]] [[Category:2003 neologisms]] [[Category:20th-century inventions]] [[Category:Authentication]] [[Category:Computer security]] [[Category:Internet bots]] [[Category:Human-based computation]] [[Category:Social information processing]]
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