XIE Nannan1, HU Liang1, Nurbol2, FAN Li1, YIN Xiaotian3
1. College of Computer Science and Technology, Jilin University, Changchun 130012, China;2. College of Information Science and Engineering, Xinjiang University, Urumqi 830046, China;3. The First Research Institute of the Ministry of Public Security of P.R.C., Beijing 100048, China