1. School of Computer Science and Engineering, Xi’an University of Technology, Xi’an, China
2. MOE Key Laboratory for Intelligent Networks and Network Security, Xi’an Jiaotong University, Xi’an, China
3. Department of Computer Science and Creative Technologies, University of the West of England-UWE Bristol, Bristol, U.K.
4. Security and Optimization for Networked Globe Laboratory (SONG Laboratory), Embry-Riddle Aeronautical University, Daytona Beach, FL, USA
5. 30th Research Institute of China Electronics Technology Group Corporation, Chengdu, China