Configuring role-based access control to enforce mandatory and discretionary access control policies

By Sylvia L. Osborn, R. Sandhu, Q. Munawer. ACM Transactions on Privacy and Security, 2000

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Role-based authorization constraints specification (2000, positive): “In Ahn [2000], it is further shown how the construction of Sandhu [1996] and Osborn et al. [2000] to respectively simulate mandatory and discretionary access controls in RBAC can be expressed in RCL 2000.”
Access Control: Policies, Models, and Mechanisms (2000, background): “, [3,36,45,56,67,76,80]), the basic concepts are common to all approaches.”