1. College of Computers, National University of Defense Technology, Changsha, Hunan, China and Information School, Hunan University of Humanities, Science and Technology, Hunan, Loudi, China
2. College of Computers, National University of Defense Technology, Changsha, Hunan, China
3. Department of Electrical Engineering, National Dong Hwa University, Hualien, Taiwan, ROC
4. Department of Information Security, Cryptology, and Mathematics, Kookmin University, Seoul, South Korea
5. National Dong Hwa University, Hualien, Taiwan, ROC
6. Technical University of Denmark (DTU), Denmark