1 Interdisciplinary Centre for Security, Reliability and Trust, University of Luxembourg, Luxembourg City, Luxembourg. Electronic address: alexander.rieger@uni.lu.
2 Interdisciplinary Centre for Security, Reliability and Trust, University of Luxembourg, Luxembourg City, Luxembourg.
3 Project Group Business & Information Systems Engineering of the Fraunhofer FIT, Bayreuth, Germany; FIM Research Center, University of Bayreuth, Bayreuth, Germany.