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Analyzing CAPTCHAs

Posted by CmdrTaco on from the i-fail-more-than-i-win dept.

Bruce Schneier's blog pointed me to a research paper on "Attacks and Design of Image Recognition CAPTCHAs" (PDF). The abstract says, "We systematically study the design of image recognition CAPTCHAs (IRCs) in this paper. We first review and examine all IRCs schemes known to us and evaluate each scheme against the practical requirements in CAPTCHA applications, particularly in large-scale real-life applications such as Gmail and Hotmail."

6 of 105 comments (clear)

  1. Re:hmm... by radicalpi · · Score: 2, Funny

    Yeah, they're Cylons.

  2. Re:PDF warning? by jolyonr · · Score: 2, Funny

    And my apologies back to you and the rest of slashdot for using the phrase 'pdf file'

    I should know better!

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    Please read my Canon EOS tech blog at http://www.everyothershot.com
  3. Re:PDF warning? by Zelkan · · Score: 2, Funny

    Sounds like a Freudian slip. Got something to tell us about your love for children?

  4. Re:hmm... by melikamp · · Score: 4, Funny

    It's happening already, I think, with turn-key solutions floating around featuring 20-35% accuracy. I don't have 100%, more like 80% or so, and I am a human.

    OT, but I found a way to make RECAPTCHA entertaining. With two words given, I always just type one of the words, and put "fuck" for the other. The accuracy falls below 50%, but the giggles make it all worthwhile.

  5. Re:Why not... by Rik+Sweeney · · Score: 3, Funny

    There are only so many such images available for use

    Not if they use images of Lady Gaga

    --
    Summation 2
  6. Re:Chinese CAPTCHA farms by clone53421 · · Score: 4, Funny

    That works too, especially if you have a good topless site to redirect the captchas toward.

    FTFY.

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    Alexander Peter Kristopeit bought his basement from his mommy for one dollar.