为了降低静态安全机制中不必要的数据源认证开销和防御信任阈值机制中存在的On-off攻击,在物联网(IoT)环境下提出了一种基于信任的自适应安全机制.首先,根据节点在信息交互中的行为表现建立节点间的信任评估模型,进而给出节点总体信任值的度量方法;然后,对于总体信任值高于信任阈值的节点,采用基于信任的自适应检测算法实时地检测这些节点总体信任值的变化情况;最终,中继节点根据自适应检测的结果决定是否验证接收到的消息.仿真实验结果和分析表明,该机制降低了中继节点的能量开销,同时对物联网中的On-off攻击起到较好的防御作用.%To reduce the unnecessary overhead of data source authentication in static security mechanism and defend the On-off attack in trust threshold mechanism,an adaptive security mechanism based on trust was proposed in the Internet of Things (IoT).Firstly,the trust evaluation model was built according to node behavior in information interaction,further the measure method for total trust value of nodes was given.Then,for the nodes whose total trust values were higher than the trust threshold,the trust-based adaptive detection algorithm was used to detect the changes of the total trust values of these nodes in real time.Finally,the relay nodes determined whether to authenticate the received message according to the returned result of adaptive detection algorithm.The simulation results and analysis show that the proposed mechanism reduces the energy overhead of relay nodes,and plays a better role in defense against On-off attacks in IoT.
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