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Methods of creating a corpus of spoken CAPTCHA challenges

  • US 9,558,337 B2
  • Filed: 07/06/2015
  • Issued: 01/31/2017
  • Est. Priority Date: 06/23/2008
  • Status: Active Grant
First Claim
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1. An automated method for generating Completely Automated Public Turing Test to Tell Computers and Humans Apart (CAPTCHA) challenge items with a CAPTCHA computing system, comprising:

  • generating a set of candidate CAPTCHA challenge items with a CAPTCHA synthesis engine operating on the CAPTCHA evaluation computing system, such that each candidate CAPTCHA challenge item includes a CAPTCHA question and a target CAPTCHA answer;

    presenting a first computer system with said set of candidate CAPTCHA challenge items;

    determining, with the first computer system, machine answers to the candidate CAPTCHA challenge items;

    with the CAPTCHA computing system and based on said machine answers, measuring an ability of said first computer system to correctly determine said target CAPTCHA answers;

    identifying with the CAPTCHA computing system, based on said measuring, at least a first candidate CAPTCHA challenge item of the set of candidate CAPTCHA challenge items for which said machine answers do not meet a threshold of acceptability and selecting the first candidate CAPTCHA challenge item as a selected CAPTCHA challenge item; and

    storing said selected CAPTCHA challenge item.

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