Information Security Theory and Practices: Security and Privacy of Pervasive Systems and Smart Devices : 4th IFIP WG 11.2 International Workshop, WISTP 2010, Passau, Germany, April 12-14, 2010, Proceedings - Pierangela Samarati, Michael Tunstall, Joachim Posegga, Konstantinos Markantonakis, Damien Sauveron ((Lecture Notes in Computer Science))