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Making CAPTCHAs Even Harder With 3-D Models

Posted by timothy on from the now-what-is-the-man-doing-with-the-rabbit dept.

Michael G. Kaplan writes "CAPTCHA (Completely Automated Public Turing Test to Tell Computers and Humans Apart) are commonly used to prevent computers from filling out web forms. Computer vision experts have been able to design programs to foil CAPTCHA with a high degree of success. I have designed a CAPTCHA that is based on the identification of attributes contained in an image generated by the grouping of easily recognized 3-D objects. I call this the Virtual Photographic CAPTCHA and it is likely to remain invulnerable to automated attack for many years to come. A novel anti-spam system necessitated its development."

5 of 326 comments (clear)

  1. Captcha's have already been cracked by tekiegreg · · Score: 5, Interesting

    Awhile back on Slashdot (I'm too lazy to find the link) there was an article on Captcha's being attacked by Spammers who would set up a porno site requiring user registration using, the Captcha in mind to crack, then forwarding the results to the anti-captcha bot.

    Vision-recognition systems be dammed, all a spammer needs to do is use the inherent need of apparently most of the male race to look at pictures of naked women to get what he needs. I don't know if a counter was ever found to this method either...

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    ...in bed
  2. Popular CAPTCHA implementation beaten by SJasperson · · Score: 5, Interesting

    http://www.brains-n-brawn.com/default.aspx?vDir=ai captcha The developer of an automated breaking bot explains how he did it.

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    Sigs? Sigs? We don't need no steenkin' sigs.
  3. Don't invest time in these things yet. by Anonymous Coward · · Score: 3, Interesting

    The federal government is considering outlawing this abusive practise. I met with a senator from SC and another from GA in the past month wrt this issue. They, like most people I know, hate it, and hate the artificial barrier it creates for Internet usage.

    I work at a school for the deaf and blind, and captcha's make it impossible for the blind or many of the vision impaired to do many things on the Internet without having help from someone with good vision. Even I, with my cheap LCD monitor and 73 year-old eyes, have trouble reading the Yahoo ones.

  4. solving the handwriting problem by bremstrong · · Score: 4, Interesting

    Use handwritten challenges and let the spammers solve the handwriting recognition problem for us.

  5. This is a bad thing for the blind. by Anonymous Coward · · Score: 3, Interesting

    And how are visually impaired people supposed to do this? Use the alt text?