This article presents a ticket-based access model forudmobile services. The model supports efficient authentication ofudusers, services and service providers over different domains.udTickets are used to verify correctness of the requested serviceudas well as to direct billing information to the appropriate user.udThe service providers can avoid roaming to multiple service domains,udonly contacting a Credential Centre to certify the user’sudticket since tickets carry all authorization information neededudfor the requested services. The user can preserve anonymity andudread a clear record of charges in the Credential Centre at anytime.udFurthermore, the identity of misbehaving users can be revealedudby a Trusted Centre.
展开▼
