Elie Bursztein, Steven Bethard, Celine Fabry, John C. Mitchell, Daniel Jurafsky. How Good Are Humans at Solving CAPTCHAs? A Large Scale Evaluation. In 31st IEEE Symposium on Security and Privacy, S&P 2010, 16-19 May 2010, Berleley/Oakland, California, USA. pages 399-413, IEEE Computer Society, 2010. [doi]
Abstract is missing.