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CAPTCHA

CAPTCHA. Presentation by Annette Tsui, Section 2. What is CAPTCHA?. CAPTCHA: Completely Automated Public Turing test to tell Computers and Humans Apart Introduced by Alan Turing in 1950 - “If a computer’s performance was indistinguishable from a human, it could be deemed intelligent.”

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CAPTCHA

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  1. CAPTCHA Presentation by Annette Tsui, Section 2

  2. What is CAPTCHA? • CAPTCHA: Completely Automated Public Turing test to tell Computers and Humans Apart • Introduced by Alan Turing in 1950 - “If a computer’s performance was indistinguishable from a human, it could be deemed intelligent.” • Still not able to do completely, but programs have been developed that are able to pass tests that humans can pass

  3. Types of CAPTCHAs • Visual-based and Sound-based • Visual-based examples: • Gimpy, EZ-Gimpy, Gimpy-r, Pessimal Print, Baffletext • Sound based: Sounds CAPTCHA used in Hotmail®, Yahoo! ®, and Altavista® new login accounts

  4. Visual-based CAPTCHAs Gimpy CAPTCHA Source: http://www.captcha.net Yahoo!® CAPTCHA (EZ-Gimpy)

  5. Visual-based CAPTCHAs Pessimal Print CAPTCHA Baffletext CAPTCHA Source: http://www2.parc.com/istl/projects/captcha/captchas.htm

  6. Further Information • The CAPTCHA Project: http://www.captcha.net • PARC (Palo Alto Research Center) website about CAPTCHAs: http://www.parc.xerox.com/research/istl/projects/captcha/ • Greg Mori’s web page about his attack on Gimpy: http://www.cs.berkeley.edu/~mori/gimpy/gimpy.html

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