Decaptcha: Breaking 75% of eBay audio CAPTChas

Elie Bursztein, Steven Bethard

Research output: Contribution to conferencePaperpeer-review

61 Scopus citations


CAPTCHA tests aim at preventing attackers from performing automatic website registration. In this paper we show that our prototype Decaptcha is able to successfully break 75% of eBay audio captchas. We compare its performance with the state of the art, readily available speech recognition system Sphinx and discuss the implications for eBay security.

Original languageEnglish (US)
StatePublished - 2009
Externally publishedYes
Event3rd USENIX Workshop on Offensive Technologies, WOOT 2009 - Montreal, Canada
Duration: Aug 10 2009 → …


Conference3rd USENIX Workshop on Offensive Technologies, WOOT 2009
Period8/10/09 → …

ASJC Scopus subject areas

  • Hardware and Architecture
  • Information Systems
  • Software
  • Computer Networks and Communications


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