Web service is a new service-oriented computing paradigm which poses the unique security challenges due to its inherent heterogeneity and highly dynamic nature. A key challenge in web service security is the design of effective access control schemas. However, traditional role-based access control (RBAC) model can not meet the dynamic and context sensitivity features of web service demands. In this paper, we propose a context based dynamic role based access control model (CDACM) for web service. Our approach grants and adapts permissions to users based on a set of contextual information collec...
