应用主观逻辑的无线传感器网络信任更新算法

摘要

To solve the distortion of trust updating for Reputation-based Framework for Sensor Networks (RFSN); an algorithm of trust updating using subject logic was presented. Firstly; the process of trust updating in RFSN was recog nized and decomposed. It was pointed out that the prime reason in the distortion of trust updating is the partial reflection of current behavior tendency of the node owning to the representation of trust in expectation of reputation variable; and the general design model was constructed. Then;the trust updating based on the expectation of reputation random variable was adjusted adaptively by importing the subject logic opinion to overlook the trust updating with comparative ly weaker support about current behavior tendency so as to avoid the distortion caused by using long-term behavior tendency oriented trust updating to reflect the current behavior tendency of the node. Finally; by J-Sim;it was demon strated that the presented algorithm could not only represent the node's long-term behavior tendency but also reflect the current behavior tendency to some extent.%为了解决基于信誉的传感器网络安全框架存在的信任更新失真问题,提出了基于主观逻辑的信任更新算法.首先,对基于信誉的安全框架的信任更新过程进行认知和分解,指出了信誉随机变量期望描述的信任无法完全反映节点当前的行为趋势是导致信任更新失真的主要原因.在此基础上给出了总体设计模型.然后,改进了基于信誉随机变量期望的信任更新,采用主观逻辑意见忽略当前行为趋势支持度低的信任更新,避免了描述长期行为趋势的信任更新在反映节点当前行为趋势时出现的失真.最后,通过仿真实验,证明了所提算法既可以描述节点的长期行为趋势,又可以在一定程度上反映节点当前的行为趋势.