Date Added: Nov 2009
Large scale distributed systems enable sharing of resources and services scattered over geographically dispersed, heterogeneous, autonomous administrative domains. Two main entities interacting with each other over a distributed system are service requesters and service providers. The service requesters belonging to a particular administrative domain may request access to resources/services available over same or other administrative domains. Similarly a service provider belonging to a particular administrative domain may expose its resources/services over same or other administrative domains. The service requesters belonging to one administrative domain generally have different access rights in different administrative domains. Determining what a service requester is authorized to do in the same or other administrative domains is a difficult task.