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CAPTCHAs

Lecture 7

2009-12-09

CAPTCHAs: telling humans and computers apart automatically.  Turing tests, reverse Turing tests, types of CAPTCHAs, text-based CAPTCHAs, methods for breaking text CAPTCHAs, visual CAPTCHAs, implicit CAPTCHAs, visual passwords.

Lecture
Reading
  • CAPTCHAs View
  • Scattertype View
  • Baffletext View
  • breaking text-based CAPTCHAs View
  • reCAPTCHA View
  • Usability of Visual PINs View
  • Security of Visual CAPTCHAs View
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