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Decaptcha Breaking 75% of eBay Audio CAPTCHAs

CAPTCHA tests aim at preventing attackers from performing automatic 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.

3rd USENIX Workshop on Offensive Technologies 2009

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BlackHat USA / Defcon
2010

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