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GENERATING HARD INSTANCES OF CAPTCHAS

  • US 20100077209A1
  • Filed: 09/24/2008
  • Published: 03/25/2010
  • Est. Priority Date: 09/24/2008
  • Status: Abandoned Application
First Claim
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1. A computer-implemented method for modifying a set of captchas based on responses to the captchas from one or more client computers, comprising:

  • classifying first ones of the responses as coming from an automated process and second ones of the responses as coming from a human;

    modifying a first one of the captchas for which the first responses represent a corresponding success rate higher than a first threshold; and

    eliminating a second one of the captchas from the set of captchas for which the second responses represent a corresponding failure rate above a second threshold.

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