1. State Grid Hunan Electric Power Company Limited, Changsha 410029, China
2. School of Mathematics and Computing Science, Guilin University of Electronic Technology, Guilin 541004, China
3. School of Computer Science and Engineering, Changsha University, Changsha 410022, China
4. Guangxi Key Laboratory of Cryptography and Information Security, School of Computer Science and Information Security, Guilin University of Electronic Technology, Guilin 541004, China