1. Network and Data Security Key Laboratory of Sichuan Province, University of Electronic Science and Technology of China, Chengdu, China
2. Department of Computer Science, National University of Computer and Emerging Sciences, Islamabad, Chiniot-Faisalabad Campus, Chiniot, Pakistan
3. School of Information and Software Engineering, University of Electronic Science and Technology of China, Chengdu, China
4. Department of Information Technology, College of Computers and Information Technology, Taif University, Taif, Saudi Arabia
5. School of Information, Systems and Modelling, University of Technology Sydney, Sydney, Australia
6. ICT Department, FPT University, Hanoi, Vietnam