1 / 6

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.”

gloria
Download Presentation

CAPTCHA

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related