We develop a formal framework of MAC policies in multilevel relational databases. We identify the important components of MAC policies and their desirable properties. The framework provides a basis for systematically specifying MAC policies and characterizing their potential mismatches. Based on the framework, we compare and unify the MAC policies and policy components that are proposed in the literature or imposed in existing systems. Our framework could be used to capture and resolve MAC policy mismatches in the trusted interoperation of heterogeneous multilevel relational databases.
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