Information Security Theory and Practices. Smart Cards, Mobile and Ubiquitous Computing Systems : First IFIP TC6 / WG 8.8 / WG 11.2 International Workshop, WISTP 2007, Heraklion, Crete, Greece, May 9-11, 2007 - Damien Sauveron, Konstantinos Markantonakis, Angelos Bilas, Jean-Jacques Quisquater ((Lecture Notes in Computer Science))