1. Department of Automation, School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai, China
2. Institute of Cyber Science and Technology, School of Electronic Information and Electrical Engineering, and the Shanghai Key Laboratory of Integrated Administration Technologies for Information Security, Shanghai Jiao Tong University, Shanghai, China
3. Hubei Key Laboratory of Distributed System Security, Hubei Engineering Research Center on Big Data Security, School of Cyber Science and Engineering, Huazhong University of Science and Technology, Wuhan, China
4. School of Software, Dalian University of Technology, Dalian City, China
5. Department of Electrical and Computer Engineer, University of Miami, Coral Gables, FL, USA