Tingting Wang 0001, Jørgen Bøegh. Multi-layer CAPTCHA Based on Chinese Character Deformation. In Yuyu Yuan, Xu Wu, Yueming Lu, editors, Trustworthy Computing and Services - International Conference, ISCTCS 2013, Beijing, China, November 2013, Revised Selected Papers. Volume 426 of Communications in Computer and Information Science, pages 205-211, Springer, 2013. [doi]
Abstract is missing.