Secure Vehicular Communication Systems: Design and Architecture Papadimitratos, Panos; Buttyan, Levente; Holczer, Tamas; Schoch, Elmar; Freudiger, Julien; Raya, Maxim; Ma, Zhendong; Kargl, Frank; Kung, Antonio; Hubaux, Jean-Pierre , IEEE Communication Magazine, nov, Volume 46, Number 11, (2008)