Song Gao, Manar Mohamed, Nitesh Saxena, Chengcui Zhang. Emerging Image Game CAPTCHAs for Resisting Automated and Human-Solver Relay Attacks. In Proceedings of the 31st Annual Computer Security Applications Conference, Los Angeles, CA, USA, December 7-11, 2015. pages 11-20, ACM, 2015. [doi]
Abstract is missing.