Decaptcha: breaking 75% of eBay audio CAPTCHAs
Elie Bursztein, Steven J. Bethard · 2009
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. 1