Jeff Yan, Ahmad Salah El Ahmad. A low-cost attack on a Microsoft captcha. In Peng Ning, Paul F. Syverson, Somesh Jha, editors, Proceedings of the 2008 ACM Conference on Computer and Communications Security, CCS 2008, Alexandria, Virginia, USA, October 27-31, 2008. pages 543-554, ACM, 2008. [doi]
Abstract is missing.