1. Collage of Mathematics and Informatics, Fujian Normal University, Fuzhou, Fujian, PR China
2. Fujian Provincial Key Laboratory of Network Security and Cryptology, Fujian Normal University, Fuzhou, Fujian, PR China
3. School of Mathematics and Physics, Fujian Provincial Key Laboratory of Big Data Mining and Applications, Fujian University of Technology, Fuzhou, Fujian, PR China