Machine learning attacks against the Asirra CAPTCHA

Philippe Golle. Machine learning attacks against the Asirra CAPTCHA. In Lorrie Faith Cranor, editor, Proceedings of the 5th Symposium on Usable Privacy and Security, SOUPS 2009, Mountain View, California, USA, July 15-17, 2009. ACM International Conference Proceeding Series, ACM, 2009. [doi]

Abstract

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