1. Interdisciplinary Center for Security, Reliability and Trust (SnT), University of Luxembourg, Luxembourg. E-mails: patrice.caire@uni.lu, assaad.moawad@uni.lu, yves.letraon@uni.lu
2. Foundation for Research and Technology – Hellas (FORTH), Institute of Computer Science, Greece. E-mail: vefthym@ics.forth.gr
3. Department of Information Studies, University College London, UK. E-mail: a.bikakis@ucl.ac.uk