Slashdot Mirror

← Back to Stories (view on slashdot.org)

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."

2 of 105 comments (clear)

  1. Re:Too focused on being perfect by Cro+Magnon · · Score: 3, Insightful

    At some point, CAPTCHAs will reach the point where ONLY a bot can get past them.

    --
    Slow down, cowboy! It has been 4 hours since you last posted. You must wait another few hours.
  2. Re:Too focused on being perfect by clone53421 · · Score: 3, Insightful

    Then they’re designed wrong.

    You should at least skim over the paper, that’s actually a significant portion of what it’s focused on... finding something that humans are good at and bots are not. As better bots have been written, that may have changed significantly... most present CAPTCHA systems are relatively broken.

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