The paper researches and analyzes the existing credibility problem for Web services. The measurement and verification method were scarce in web service composition. An integrity measurement scheme based on the state keeping is proposed in the paper. In the way of measurement and verification of integrity,the credibility can be handed on among platforms and services. To extend the credibility from platform to service, the static measurement and verification method of atom services on trusted computing platforms are discussed. For dynamic Web service composition, an integrity measurement method is proposed based on state keeping. For uncertain situation of the service composition environment in the practical application,a locking scheme of the service provider platform is proposed so that the state of the service provider is maintained to guarantee the credibility of the service.%本文对Web服务的可信性问题进行了研究与分析.针对互联网上Web服务组合缺乏可信性验证方法的问题,提出一种基于状态保持的完整性测量方法.通过对完整性的测量与验证,使得可信性可以在平台及服务之间进行传递.首先讨论了在可信计算平台上原子服务可信性测量及验证方法,该方法可以将信任从平台扩展至服务,这是一种静态的测量方法.对于动态性较强的服务组合,在静态测量的基础上提出了基于状态保持的完整性测量方法.针对实际应用中服务组合环境不固定的状况,提出一种锁定服务提供者平台的方案,使服务提供者平台的状态得以保持,维持了服务的可信性.
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