CAPTCHA - PowerPoint PPT Presentation

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CAPTCHA

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

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Title: CAPTCHA


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
    computers 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/captch
a/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 Moris web page about his attack on Gimpy
    http//www.cs.berkeley.edu/mori/gimpy/gimpy.html
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