1. School of Cyberspace Security, State Key Laboratory of Networking and Switching Technology, Beijing University of Post and Telecommunications, Beijing, China
2. School of Cyberspace Science and Technology, Beijing Institute of Technology, Beijing, China
3. Information Security Office of the Internet of Vehicles Business Department, China Automotive Data Corporation, Tianjin, China
4. Department of Information and Electronic Engineering, Muroran Institute of Technology, Muroran, Japan