Negotiation-Based Dynamic Role Transition in Data Access across Multi-VOs

This paper proposes an approach to data access across multi-Vos (virtual organizations), using dynamic role transition under role-based access control model in data grid. A negotiation mechanism is introduced to establish the data access based on the trust of both VOs, which also sets up the role transition relationship between them. Once the negotiation succeeds, the dynamic role transition is controlled by several local policies according to