Information Security Theory and Practices. Smart Devices, Convergence and Next Generation Networks : Second IFIP WG 11.2 International Workshop, WISTP 2008, Seville, Spain, May 13-16, 2008 - Jose A. Onieva, Damien Sauveron, Serge Chaumette, Dieter Gollmann, Konstantinos Markantonakis ((Lecture Notes in Computer Science))