CAPTCHA Presentation by Annette Tsui, Section 2. What is CAPTCHA? zCAPTCHA: Completely Automated Public Turing test to tell Computers and Humans Apart.

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Presentation transcript:

CAPTCHA Presentation by Annette Tsui, Section 2

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

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

Visual-based CAPTCHAs Yahoo!® CAPTCHA (EZ-Gimpy) Gimpy CAPTCHA Source:

Visual-based CAPTCHAs Pessimal Print CAPTCHA Baffletext CAPTCHA Source:

Further Information zThe CAPTCHA Project: zPARC (Palo Alto Research Center) website about CAPTCHAs: s/captcha/ zGreg Mori’s web page about his attack on Gimpy: