网格环境中改进的基于域的信任模型

由于网格技术的动态性和不确定性所带来的安全问题，网格实体间的信任关系已经成为网格安全研究的热点问题。根据网格技术的特点，在研究现有信任关系的基础上提出一种改进的基于域的分层信任模型来处理网格环境中实体之间的信任关系，该模型把管理域的信任关系分为域内关系和域间关系来处理，并完善信任值的更新机制和时间衰减影响因子。分析和实验仿真表明，该模型在有效性方面显示出更好的性能，是对网格信任模型的有效补充。

Improved Domain-based Trust Model in Grid Environment

The study on trust relationship among grid entities is the hot point of grid security because of the security problem resulting from the dynamics and the uncertainty of grid technology. According to the characteristic of grid technology, an improved layered trust model that is based on domain is presented under the study of the available trust relationship. This model is used to deal with trust relations among entities in the grid environment. The model takes different ways to deal with trust relation in and between domains, the update mechanism of the trust value and the attenuation factor of time. A preferable performance in availability of the model is indicated through analysis and experiment simulation, and it is the efficient supplement to trust models in grid.