1. College of Information Engineering, Northwest A and F University, Yangling, China
2. Ministry of Education, School of Cyber Science and Engineering, Key Laboratory of Aerospace Information Security and Trusted Computing, Wuhan University, Wuhan, China
3. Information Systems Technology and Design Pillar, Singapore University of Technology and Design, Singapore, Singapore
4. School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou, China
5. School of Communications and Electronics Engineering, Shanghai Key Laboratory of Multidimensional Information Processing, East China Normal University, Shanghai, China