1. School of Mathematics and Statistics and Ministry of Education Key Lab of Intelligent Networks and Network Security, Xi’an Jiaotong University, Xi’an 710049, Shaan’xi, China.
2. School of Computer Science and Technology and Ministry of Education Key Lab For Intelligent Networks and Network Security, Xi’an Jiaotong University, Xi’an 710049, China.
3. School of Mathematics and Statistics, Xidian University, Xi’an 710126, China.
4. Corresponding author. School of Mathematics and Statistics and Ministry of Education Key Lab of Intelligent Networks and Network Security, Xi’an Jiaotong University, Xi’an, Shaanxi, China, and Pazhou Laboratory (Huangpu), Guangdong, Guangzhou, China.