作者机构:[1]College of Mathematics & Computer Science, Hebei University, Baoding 071002, China, [2]Department of Modern Science & Technology, Agricultural University of Hebei, Baoding 071002, China
相关基金:Supported by the National Natural Science Foundation of China (No. 60873203), the Foundation of Key Laboratory of Aerospace Information Security and Trusted Computting, Ministry of Education (No. AISTC2009_03), Hebei Natural Funds for Distinguished Young Scientists (No. F2010000317), and the Natural Science Foundation of Hebei Province (No. F2008000646).