Recently, administration of RBAC systems using a role-based approach has become very appealing because of the benefits that such an approach typically brings. This approach uses RBAC itself to manage RBAC policies so that the administration functions can be decentralized and made more efficient. Existing RBAC administration models, however, fail to deal with RBAC systems with hybrid hierarchy, which has been shown to be necessary to specify fine-grained RBAC policies. In this paper, we propose a Scoped Administration model for RBAC with Hybrid Hierarchy (SARBAC07) by using the notion of an administrative scope that was earlier proposed in the SARBAC model. We show that our model keeps all the advantages of the original model and can deal with more complex situations where hybrid hierarchy is needed.
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