Policy-based dynamic negotiations allow more flexible authorization  in complex Grid environments, and relieve both users and administrators from up  front negotiations and registrations. This paper describes how such negotiations  overcome current Grid authorization limitations, and how policy-based negotiation  mechanisms can be easily integrated into a Grid infrastructure. Such an extension  provides advanced access control and automatic credential fetching, and  can be integrated and implemented in the new version 4.0 of the Globus Toolkit

Authorization Ionut Constandache