基于时间帧信任值的计算方法

针对现有的信任模型对节点行为改变的动态适应能力和对反馈信息的有效聚合能力支持不足，提出了一种基于时间帧信任值的计算方法，使用时间帧标示出经验和推荐时间特征，引入近期信任、长期信任、累积滥用信任和反馈可信度4个参数来计算节点信任度，并通过反馈控制机制动态调节上述参数，提高了信任模型的动态适应能力。与以往的信任值的计算方法相比，该方法具有更好的动态适应能力和反馈信息有效聚合能力，能够有效处理动态恶意节点策略性的行为改变和不诚实反馈对系统的攻击。

Time-frame based algorithm of trust value

In order to resolve the security problems due to the dynamics and uncertainty of grid environment,we develop a new trust model,it discriminates the trust relationships between entities in the same autonomous domain and in different domains and handles the two different trust relationships with different approaches.By doing this,we can evaluate the trust relationships between entities more precisely,thus can resolve security problems exist in grid environment more effectively,which can be verified by simulated experiments.