综合指数法的信任网格动态综合评价模型

Comprehensive Index Method Evaluation Model in Trust Grid

在网络安全问题的研究中,信任评价是网格安全领域中的难点内容。为了保障信息网格领域中节点的可靠性、解决传统信任评价模型不能有效评估节点综合信任度的问题,保证网络传输的安全性,利用综合指数法,对网格节点的直接、间接信任度、时间衰减度建立了一种综合信任评价模型。模型可从网格实体间交互情况提取信任信息,从而综合评价某节点的总体信任度。通过设置系统阈值对网格中的实体进行交互控制,并进行仿真。仿真实验表明,信任管理模型能够提高信息网格中任务运行的成功率,有效的减少网格环境的不确定性对任务执行的影响,确保了网络的安全。

Trust evaluation is the difficult point in security fields of grid.To ensure the reliability of the nodes in the field of information grid and solve the problem that the traditional trust evaluation cannot evaluate trust degree of nodes effectively,comprehensive index method was used to build a comprehensive trust evaluation model,which was for the direct trust and indirect trust between grid nodes,and the evaluation density of the nodes in the unit time.This model can extract trust information from the interaction between the entities in the grid,and then evaluate one node＇s overall trust degree synthetically.The entities in the grid were controlled interactively by setting system threshold.The simulation shows that this model can improve grid mission success rates,and reduce the influence of the grid uncertainty.