国家自然科学基金61602118,61572010,61472074;福建师范大学"网络与信息安全关键理论和技术"校创新团队IRTL1207;福建省自然科学基金2015J01240,2017J01738;National Natural Science Foundation of China61602118, 61572010, 61472074;Fujian Normal Univer-sity Innovative Research TeamIRTL1207;Natural Science Foundation of Fujian Province2015J01240, 2017J01738