T—YUN：云提供商可信性审计与验证

云计算被广泛认为是信息技术发展的必然趋势。然而，由于在云计算模式下用户失去了对托管在云端的数据和应用的直接控制能力，产生了云服务的可信性问题，严重影响了云计算与云服务的推广。文章设计实现了一种新的通过可信第三方TTP（TrustedTMrdParty）对云提供商可信性进行审计和验证的模型。为了防止TTP成为单点瓶颈或单点故障，通过云计算技术构建TTP云验证平台实现了原型系统，并对其进行定量测试、分析和评价。实验结果表明，T—YUN在有效验证可信性的同时没有引入过多的额外代价。

T-YUN: Trustworthiness Audit and Verification of the Cloud Providers

Cloud computing is broadly recognized as the trend of IT.However, in cloud computing mode, customers lose the direct control of their data and application outsourced to or hosted by the cloud providers, which leads to the trustworthiness issue of cloud services, hindering the widespread use of cloud computing.This paper designed and implemented a novel trust framework which involves a Trusted Third Party to audit and verify the trustworthiness of cloud providers. Moreover, in case of becoming the single point of failure or single point of performance bottleneck, this paper designed and implemented a cloud based TTP platform, which reflects idea of "The small cloud audits the big clouds". At the last, This paper implemented a prototype, and took a quantitative evaluation of the prototype. The experiments demonstrated that T-YUN brings little extra cost on the performance while provides trustworthiness guarantee.