Institution: | 1. School of Mathematical Sciences, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;2. School of Mathematical Sciences, LMIB of Ministry of Education, Beijing University of Aeronautics and Astronautics, Beijing 100191, China;3. State Key State Laboratory of Information Security, Graduate School of Chinese Academy of Sciences, Beijing 100049, China;4. School of Mathematical Sciences, Peking University, Beijing 100871, China |