Hendrik Meutzner, Santosh Gupta, Dorothea Kolossa. Constructing Secure Audio CAPTCHAs by Exploiting Differences between Humans and Machines. In Bo Begole, Jinwoo Kim, Kori Inkpen, Woontack Woo, editors, Proceedings of the 33rd Annual ACM Conference on Human Factors in Computing Systems, CHI 2015, Seoul, Republic of Korea, April 18-23, 2015. pages 2335-2338, ACM, 2015. [doi]
Abstract is missing.