• Honeypot Captcha
  I was thinking about alternative ways to block comment spam the other day and it occurred to me that there’s potentially a simpler solution than the Invisible Captcha approach I wrote about.
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• /aiCAPTCHA : CAPTCHA Comment Spammer
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• 3-D CAPTCHA
  The following is a design for a CAPTCHA that is likely invulnerable to automated decryption. I originally developed this as part of an anti-spam system that was a very early progenitor of Receiver Initiated Authentication. This CAPTCHA should be particularly invaluable given the recent reports that bots now have as high as a 35% successful attack rate against both the Microsoft and Yahoo CAPTCHA.
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• Computerworld - How CAPTCHA got trashed
  CAPTCHA used to be an easy and useful way for Web administrators to authenticate users. Now it's an easy and useful way for malware authors and spammers to do their dirty work.
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• Create New Journal
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• Damien Katz: Negative CAPTCHA
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• ha.ckers.org web application security lab - Archive » Solving CAPTCHAs for Cash
  I had a really interesting conversation with a guy out of Romania this morning regarding a team of CAPTCHA solvers that he has set up. The basic premise is that he has 5 guys set up to solve CAPTCHAs like Yahoo, MySpace, and Hotmail. He does this for clients all over the world.
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• Human Computation - Luis von Ahn
  Google TechTalks July 26, 2006 ABSTRACT Tasks like image recognition are trivial for humans, but continue to challenge even the most sophisticated computer programs. This talk introduces a paradigm for utilizing human processing power to solve problems that computers cannot yet solve. Traditional approaches to solving such problems focus on improving software. I advocate a novel approach: constructively channel human brainpower using computer games.
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• Inaccessibility of CAPTCHA
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• Inaccessibility of Visually-Oriented Anti-Robot Tests
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• KittenAuth Test
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• reCAPTCHA
  Stop Spam, Read Books
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captcha from all users