1. School of Computer and Communication Engineering, Changsha University of Science and Technology, Changsha 410114, China
2. Guangxi Key Laboratory of Cryptography and Information Security, Guilin University of Electronic Technology, Guilin 541004, China
3. School of Information and Electrical Engineering, Hunan University of Science and Technology, Xiangtan 411201, China
4. College of Information Science and Engineering, Jishou University, Jishou 416000, China
5. College of Computer Science and Electronic Engineering, Hunan University, Changsha 410082, China