Kurt Alfred Kluever, Richard Zanibbi. Balancing usability and security in a video 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 is missing.