However, the paper addresses mainly aspects of authentication and secure communication with emphasis on protocols and encryption and anonymity enforcement. SAW s enforce mandatory access control.
Mediators check incoming requests and outgoing results as well with the help of rules.
Trusted third parties sign certificates and credentials. An access consists in a preparatory and a query phase. J. Biskup, U. Flegel, and Y. Karabulut. A mediator manages queries on behalf of a user by identifying and addressing appropriate subqueries to heterogeneous and autonomous data sources and by subsequently collecting and integrating the returned answers. These technologies potentially provide for an inherently scalable and secure mechanism for widely distributing assured authentication and authorization attributes.