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ReCAPTCHA.net Now Vulnerable to Algorithmic Attack

Posted by timothy on from the bless-you! dept.

n3ond4x writes "reCAPTCHA.net algorithms have been developed to solve the current CAPTCHA at an efficacy of 30%. The algorithms were disclosed at DEFCON 18 over the weekend and have since been made available online. Also available is a video demonstration of random reCAPTCHA.net CAPTCHAs being subjected to the algorithms." There's probably an excellent Firefox plugin to render this page's color scheme more bearable. Note: the PowerPoint presentation linked opens fine in OpenOffice, and the video speaks for itself.

2 of 251 comments (clear)

  1. Is this related? by Khyber · · Score: 4, Interesting

    Anybody that pays attention to 4chan recently knows they had to implement captcha due to a massive spamflood of infected morons. recaptcha got busted thanks to someone in /g/ who leaked the vulnerability in the sound system for reCAPTCHA, and the whole site was again inundated with spam, though not to the degree as the original spam attack.

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    Still waiting on Serviscope_minor to wake up to fucking reality and realize that Jessica Price isn't going to fuck him.
  2. Re:Speaking about re-captcha by imsabbel · · Score: 4, Interesting

    Hm.
    So its for-profit work for the biggest advertising firm in the world.
    Sort of expected project gutenberg or something.
    Too bad.

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    HI O WISE PRINCE. WHT TOOK U SO DAM LONG?