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Overview:

This paper describes several bottom-up approaches to problems in role engineering for Role-Based Access Control (RBAC). The salient problems are all NP-complete, even to approximate, yet they find that in instances that arise in practice these problems can be solved in minutes. The paper first considers role minimization, the process of finding a smallest collection of roles that can be used to implement a pre-existing user-to-permission relation. They introduce fast graph reductions that allow recovery of the solution from the solution to a problem on a input graph. For the test cases, these reductions either solve the problem, or reduce the problem enough that they find the optimum solution with a (worst-case) exponential method.

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Format:PDFSize:291 KB
Date:Apr 2008
Pages:11

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