An authorization mechanism for a relational database system
ACM Transactions on Database Systems (TODS)
Operating System Structures to Support Security and Reliable Software
ACM Computing Surveys (CSUR)
Implementation of integrity constraints and views by query modification
SIGMOD '75 Proceedings of the 1975 ACM SIGMOD international conference on Management of data
On interaction with data bases
SIGFIDET '74 Proceedings of the 1974 ACM SIGFIDET (now SIGMOD) workshop on Data description, access and control
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We say that an authorization scheme exhibits synergistic effects if it allowes for the power provided by the union of two privileges to be larger than the union of the powers of the individual privileges. This phenomenon where the whole is larger than the sum of its parts is shown to be essential for the support of some important classes of authorization policies, and useful for the optimization of the enforcement of authorization-based rules. An authorization scheme which exhibits synergistic effects is introduced and some of its applications are discussed.