国家自然科学基金项目61702401;陕西省自然科学基础研究计划重点项目2016JZ021;广西密码学与信息安全重点实验室研究课题GCIS201606National Natural Science Foundation of China61702401;Key Project of Natural Science Basic Re-search Plan in Shaanxi Province of China2016JZ021;Guangxi Key Laboratory of Cryptography and Information SecurityGCIS201606