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Systems and security products based on the RBAC model have been widely introduced to enterprises. Especially, the demands on enforcement of enterprise-level security policies and total identity management are rapidly growing. The RBAC model needs to be extended to deal with various circumstances of large enterprises, such as geographical distribution and heterogeneous environments including physical access control. In this paper, we introduce a new RBAC model, suitable for single sign-ondoi:10.1007/978-0-387-85691-9_9 fatcat:dn35aijq65hfppvy2oykdv7qsi