1. School of Information and Communication Engineering, Beijing University of Posts and Telecommunications, Beijing, China
2. ITrust, Centre for Research in Cyber Security, Singapore University of Technology and Design, Tampines, Singapore
3. School of Computer Science and Engineering, Macau University of Science and Technology, Macau, China
4. Faculty of Applied Sciences, Macao Polytechnic University, Macau, China
5. School of Mathematics and Computer Science, Zhejiang Agricultural and Forestry University, Hangzhou, China