关键词: 云计算, 信任, 声誉, 服务等级协议, 服务属性

Abstract:

The service consumers lack trust in cloud service providers in the interactive process. Aiming at the problem, a trust model of cloud computing based on Service Level Agreement (SLA) was proposed. In the model, when registering to a third-party trust platform which called service center, a cloud service provider must submit its strength evaluation report on its strength, operations, technologies and service attributes, etc. According to the relevant criteria, service center made an evaluation of the cloud service provider and got the system trust. Then, the system trust was combined to traditional reputation. Thus, direct trust, indirect trust and system trust were made as three important factors for evaluating a cloud service provider, and the last trust value was calculated. Finally, the service consumer could make the SLA negotiation with the service provider according to the service and the last trust value, was used to determine the selection from multi-service providers. Thus, the dishonest or less reputable cloud service providers were excluded. The experimental results show that the last trust value is obtained more comprehensively and accurately due to the introduction of system trust and service consumer can select the cloud service provider with high credibility, which can effectively prevent the dishonest behaviors of cloud service providers and improve the success rate of interaction in the proposed trust model.

Key words: cloud computing, trust, reputation, Service Level Agreement (SLA), service property