摘要
在开放的数据网格中,动态反映资源可信度是一个主要安全问题。本文提出了一种新的信任模型,动态评估资源的信任值,从而提高教育资源网格的安全性和可扩展性。该模型根据实体访问资源的推荐信任值、资源的被访问频率以及资源所在域的信任度综合评估资源信任度。通过和目前流行的针对行为的信任评估模型的实验时比,本文提出的信任模型具有更低的时间复杂度,信任度的评估也更可靠。实验结果表明,该信任模型可作为一种有效的手段,不但可以为数据网格中对资源的信任决策提供支持,防止恶意资源破坏的扩散,同时还能提高资源检索的可靠度。
In the opening data grid, reflecting resources dependability dynamically is a basic problem. In this paper a new trust model is presented to enhance security and extensibility of education resource grid by evaluating resources＇ trust dynamically. For evaluating resources＇ trust, the trust model combines entity＇s commendatory trust, resource access frequency and the current domain trust of the resource. Compared with other current trust models, our experiment results show that the trust model proposed has lower time complexity and better dependability. Furthermore, experiment results also show our trust model is an effective method in that it not only provides measures for decisionmaking of resource trust, which helps to limit the bad effects of malicious resources in data grid, but also increases retrieval accuracy of resources.
出处
《计算机科学》
CSCD
北大核心
2007年第9期83-86,共4页
Computer Science
基金
国家发改委基金项目(CNGI-04-15-3A)
关键词
教育资源
数据网格
信任模型
安全
Education resource, Data grid, Trust model, Security
