大规模分布式环境下动态信任模型研究  

Research on Dynamic Trust Model for Large Scale Distributed Environment

作　　者：李小勇[1] 桂小林[1] 

机构地区：[1]西安交通大学电子与信息工程学院,陕西西安710049

出　　处：《软件学报》2007年第6期1510-1521,共12页Journal of Software

基　　金：国家自然科学基金No.60273085;新世纪优秀人才支持计划No.NCET-05-0829~~

摘　　要：随着网格计算、普适计算、P2P计算、AdHoc等大规模的分布式应用系统的深入研究,系统表现为由多个软件服务组成的动态协作模型.在这种动态和不确定的环境下,PKI(pubic key infrastructure)中基于CA(certificate authority)的静态信任机制不能适应这种需求,动态信任模型是新的研究热点.分析了动态信任关系的相关概念、主要问题和研究方法;选取新的、典型的动态信任模型及其使用的数学方法进行评述,并进行了各种算法的比较性总结;分析了目前研究中的问题,并展望了其未来的发展方向.研究表明,动态性是信任关系量化与预测的最大挑战.今后的工作重点是对信任动态性的本质属性作进一步的理论研究,为实际应用提供坚实的理论基础.With the in-depth researches of large scale distributed systems, such as Grid computing, Ubiquitous computing, P2P computing, Ad hoc networks, etc, system is a dynamic and cooperative model made up of multi-software serving. Under these dynamic and uncertainty environments, trust mechanism based on CA （certificate authority） in a regular PKI （pubic key infrastructure） can＇t adapt to these requirements. Dynamic trust mechanism is a new and hot topic of security research for these new distributed applications. In this paper, firstly, the concepts, problems, and research approaches of dynamic trust relationship are summarized and presented. Secondly, several typical dynamic trust model systems including their mathematical methods are described in detail. And then, this paper presents the results of comparative evaluation of these models under a selection of scenarios. Finally, the current problems and the challenges of this field for future research are presented. The research work indicates that the dynamic nature of trust creates the biggest challenge in measuring trust and predicting trustworthiness. So the future work will focus on the theoretical research of dynamic trust relationships to present a solid theoretical foundation for the practical applications.

关 键 词：分布式系统 信息安全 动态信任模型 上下文 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]