1. College of Computer Science and Software Engineering, Shenzhen University, Shenzhen, China
2. Cybersecurity Program, St. Bonaventure University, St. Bonaventure, NY, USA
3. Department of Electrical Engineering and Computer Science, Security and Optimization for Networked Globe Laboratory (SONG Lab), Embry–Riddle Aeronautical University, Daytona Beach, FL, USA