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基于证据理论的信任模型是IP分布式网络中最常用的信任模型.在实际应用中需要解决两个问题:一是如何在缺少可靠的网络上层证据或者无法获取网络上层证据情况下计算信任值;二是在使用底层证据作为信任计算基础时必须考虑底层证据有连续稳定的特点.本文通过定义链路状态质量评价函数和对证据的信任态度函数,改进关于连续行为的链路状态证据特征的可信值计算方法,提出了在IP网络中使用连续链路层证据评价机制来考查节点的信任关系的模型.最后模拟无线IP网络环境中进行测试,结果验证表明:基于链路状态质量评价的连续证据序列的可信值计算,在上层信任证据缺乏的情况下可作为上层证据评估的很好的补充和纠错,使得信任计算结果更为合理和可信.
The trust model based on evidence theory is the most commonly used trust model in IP distributed networks.There are two problems that need to be solved in practical application: one is how to calculate the trust value in the absence of reliable evidence of the upper layer network or the failure to obtain the upper layer evidence in the network; Secondly, when the underlying evidence is used as the basis of trust calculation, the underlying evidence must be considered to be continuous and stable.This paper improves the characteristics of the link state evidence on continuous behavior by defining the link state quality evaluation function and the trust attitude function on evidence This paper proposes a model to evaluate the trust relationship of nodes by using the continuous link layer evidence evaluation mechanism in IP network.Finally the simulation is carried out in a wireless IP network environment and the results show that the quality of link state quality assessment is continuous The calculation of the credible value of the evidence sequence can be used as a good complement and error correction for the evaluation of the upper evidence in the absence of the evidence of the superior trust, so that the trust calculation result is more reasonable and credible.