一种面向信誉主观性和时变性的云服务信任管理方法

反馈信息不能反映评价人的个人偏好,且其评价的重要程度随时间增加逐渐消减.为此,在充分考虑评价人的个人偏好基础上提出了一个基于信誉的信任管理框架.该框架主要包括基于决策树的信任计算模型和时间衰减计算模型.最终使得云服务的信誉值不再仅仅局限于反映云服务质量的一个客观数值,而是更能体现出不同云服务评价人的主观性.在该模型的基础上,进行了实验对比分析.实验分析结果表明,与现有的信誉评价模型相比,采用决策树和时间衰减模型信誉评价更为精确.

A Subjectivity and Time-Varying Reputation-Oriented Trust Management Method in Cloud Services

Currently, most of cloud service requesters select cloud services ( cloud storage, cloud plat-forms, etc. according to the evaluation by the evaluators. This evaluation is based an objective criterion which is neglected with the difference of preferences between the requester and the evaluators. However, the issues of the evaluation with individual' s preferences, which is the value of evaluation with the re-quester' s subjective sense and the value of evaluations wearing off with time going, are in normal sense. Taking the subjectivity and time-varying of evaluations into consideration, a decision tree and time decay to assess trust model was proposed. In detail, the reputation value of cloud services no longer regards the quality of service as an objective value, but the difference of the cloud services users' subjective con-sciousness. Experiments was conducted based on the proposed model. It is shown that this model can provide more accurate reputation values based on the cloud customers' feedbacks than the existing repu-tation evaluation model.