Yuki Ikeya, Masahiro Fujita, Junya Kani, Yuta Yoneyama, Masakatsu Nishigaki. An Image-Based CAPTCHA Using Sophisticated Mental Rotation. In Theo Tryfonas, Ioannis G. Askoxylakis, editors, Human Aspects of Information Security, Privacy, and Trust - Second International Conference, HAS 2014, Held as Part of HCI International 2014, Heraklion, Crete, Greece, June 22-27, 2014. Proceedings. Volume 8533 of Lecture Notes in Computer Science, pages 57-68, Springer, 2014. [doi]
Abstract is missing.