Riccardo Focardi, Andrew C. Myers: Principles of Security and Trust - 4th International Conference, POST 2015, Held as Part of the European Joint Conferences on Theory and Practice of Software, ETAPS 2015, London, UK, April 11-18, 2015, Proceedings. Lecture Notes in Computer Science 9036, Springer 2015, ISBN 978-3-662-46665-0