Securing context-aware applications using environment roles

In the future, a largely invisible and ubiquitous computing infrastructure assist people with a variety of activities in the home and at work. applications that will be deployed in such systems will create and private information and will provide access to a variety of other. Securing such applications is challenging for a number of. Unlike traditional systems where access control has been explored, decisions may depend on the context in which requests are made. We how the well-developed notion of roles can be used to capture -relevant context of the environment in which access requests are. By introducing environment roles, we create a uniform access control that can be used to secure context-aware applications. We also a security architecture that supports security policies that make of environment roles to control access to resources.