1. Key Laboratory of Aerospace Information Security and Trusted Computing Ministry of Education, School of Cyber Science and Engineering, Wuhan University, Wuhan, China
2. School of Cyber Science and Engineering, Wuhan University, Wuhan, China
3. Center of Excellence in Information Assurance, College of Computer & Information Sciences, King Saud University, Riyadh, Saudi Arabia
4. School of Mathematics and Statistics, Fujian Normal University, Fuzhou, China
5. Department of Information Systems and Cyber Security and the Department of Electrical and Computer Engineering, University of Texas at San Antonio, San Antonio, TX, USA