Affiliation: | 1.School of Information Science and Engineering, Hebei University of Science and Technology, Shijiazhuang, People’s Republic of China ;2.Hebei Key Laboratory of Network and Information Security, Hebei Normal University, Shijiazhuang, 050024, China ;3.College of Information Engineering, Qingdao Binhai University, Qingdao, 266555, People’s Republic of China ;4.Department of Information Science & Technology, Pennsylvania State University, 1600 Woodland Rd., Abington, PA, 19001, USA ; |