1. Computer Engineering and Networks Laboratory, Faculty of Engineering and Architecture Università degli Studi di Enna, Kore Enna Italy
2. Dipartimento di Automatica e Informatica Politecnico di Torino Turin Italy
3. College of Computer Science and Technology Zhejiang University of Technology Hangzhou China
4. Department of Information Security Engineering Soonchunhyang University Asan‐si Choongchungnam‐do Korea