中文摘要：

针对动态性SSDF攻击对协作频谱感知技术的危害性,实时观察分析认知用户的感知行为,提出一种动态信任评估机制。根据认知用户的历史感知变化情况,引入时间衰减因子、加性奖励因子和加性惩罚因子,计算出随时间和协作次数不断变化的动态信任值,选取可信认知用户参与协作感知,提高了数据融合中心的协作判决准确性。仿真结果表明,动态信任机制可以有效抑制恶意用户的信任值增长,降低对＂OR＂、＂AND＂和＂Majority＂3种常用协作频谱感知数据融合准则的攻击成功率。

英文摘要：

Considering the harmful effect of dynamic SSDF attack against cooperative spectrum sensing technologies,a dynamic trust evaluation scheme based on the real-time observation and analysis of cognitive users ＇ sensing behaviors was proposed. Time attenuation, additive reward and additive penalty factors based on the historical sensing variation of cognitive users were introduced to calculate the dynamic trust value which changes with time and the number of collaborations. Meanwhile, trusted cognitive users were selected to participate in cooperative sensing, and thus improving the accuracy of the final sensing decision. Simulation results show that the scheme can effectively suppress the growth of trust of malicious users, and reduce the attack success rate for ＂OR＂, ＂AND＂ and＂Majority＂ which are three kinds of cooperative spectrum sensing data fusion schemes.