Small-World Based Trust Evaluation Model for Web Service

As popular web applications, web services can provide very flexible application integration taking advantage of existing Internet protocols and open standards. However, there are a few stubborn problems which exist in its architectures, for example, security. Especially in distributed services environment, trust which is a proved way to resolve security problem of web service is crucial to service providers and service customers for protecting service transactions and message delivering. In this paper, a web services trust evaluation model based on small world model is proposed. Firstly, an expanded subjective logic model is proposed. Secondly, a framework of SOA is built upon trust management module. Thirdly, the computing of subjective logic is improved based on small world, and the components in SOA are organized in small world. And then, the trust architecture of web service is presented. Finally, a simulation platform is used to study the evolution process of trust value in the model. The experiments and analysis show that the model can support evolving the web services trust.