[1] V. N. Karazin Kharkiv National University, Faculty of Computer Science, Department of Information and Communication Systems Security, Kharkiv,61022, Ukraine
[2] University of Macerata, Communication and International Relations, Department of Political Science, Macerata,62100, Italy
[3] Comenius University Bratislava, Department of Information Management and Business Systems, Bratislava,820-05, Slovakia
[4] University of Macerata, Department of Law, Macerata,62100, Italy
[5] University of Macerata, Department of Economics and Law, Macerata,62100, Italy
[6] Marche Polytechnic University, Department of Information Engineering, Ancona,60131, Italy