云计算环境下的信任评估模型

摘要

Aiming at the internal trust problem of cloud computing environment,a trust evaluation model based on evidence theo-ry was proposed to provide decision support for resource allocation and scheduling of the cloud center.In the process of trust evaluation,considering the large number of uncertain factors in cloud environment,trust relationship was divided into “trusted”,“untrusted”,“uncertain”,trust was evaluated from these aspects.On the basis of the entity’s central processing unit (CPU), memory,disk and network status,the information was fused to get the direct trust value.According to the interaction between the entity and the cloud center,the indirect trust value was acquired.The comprehensive trust value was obtained using the weighted average of direct trust and indirect trust.The simulation results show that the proposed trust model can accurately and effectively evaluate the trust.%针对云计算环境内部的信任问题，提出一种基于证据理论的信任评估模型，为云中心的资源分配及调度提供决策支持。在对信任评估的过程中，考虑到云环境中存在着大量的不确定性因素，将信任关系分为“可信”、“不可信”、“不确定”，从这3方面对信任进行评估。根据实体的中央处理器(CPU)、内存、磁盘、网络状况，得到直接信任值；根据实体与云中心的交互情况，得到间接信任值；进行加权平均得到综合信任值。仿真结果表明，该信任模型能够准确有效的对信任做出评估。