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Overlay networks have been studied extensively in recent years as a flexible means to improving the reliability, resiliency, and performance of many networking applications. In this paper, the authors present a novel use of overlay networks and distributed mechanisms to construct them for handling information assurance issues in networking systems. The problem is explored in the context of constructing an overlay that satisfies a given access control policies in decentralized information sharing systems. They formulate a new graph-theoretic optimization problem of constructing a minimum policy-compatible graph, which is NP-complete.
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