CAPTCHA

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Revision as of 14:02, 6 April 2009 by Dangelsm (Talk)
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Image:Sin_captcha.jpg

References

  1. Luis von Ahn, Ben Maurer, Colin McMillen, David Abraham and Manuel Blum. 2008. reCAPTCHA: Human-Based Character Recognition via Web Security Measures. In Science.
  2. Luis von Ahn, Manuel Blum, Nicholas Hopper, and John Langford. CAPTCHA: Using Hard AI Problems for Security. In Eurocrypt.
  3. Luis von Ahn, Manuel Blum and John Langford. 2004. Telling Humans and Computers Apart Automatically. In Communications of the ACM.
  4. Carnegie Mellon University. 2009. What is a CAPTCHA?.
  5. Willis, John M. 2008. Top 10 Worst Captchas
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