基于最近服务的层次式网格信任模型

Grid Trust Model Based on Last Service and Hierarchy

阐述了网格环境中信任模型的需求,并分析了传统网格信任模型的优缺点,由此提出了基于最近服务的层次式网格信任模型,设计了相应的计算公式。与传统的信任模型相比较,该模型占用网格资源少、信任评估复杂度低、可伸缩性强,能够较好地抑制网格环境下的恶意评价和协同作弊的威胁。采用改进后的网格仿真工具GridSim进行模拟实验,结果表明该信任模型提高了网格系统的可靠程度。

This paper describes the needs for trust models in grid environment,and analyzes the advantages and disadvantages of traditional grid trust models.A grid trust model based on the last service and hierarchy is presented,and the corresponding calculation formula is designed.Compared with the traditional grid trust model,the proposed model has such advantages as less resources occupied,low complexity of trust assessment and increased flexibility.Moreover,it can prevent the threat of malicious evaluation and cooperative cheating in grid environment.Experimental results with the improved grid simulation tool GridSim indicate that the trust model enhances the reliability of the grid system.