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The purpose of this paper is to describe the new approaches necessary to protect the new power grid This paper advocates the approach of protecting critical subnetworks as a reconfiguration strategy and assess the secure control system requirements to protect those critical subnetworks. As architectures, strategies, policies and technology black boxes are proposed; a methodology is required to evaluate the comparative increases in reliability and security obtained. To understand the scope, magnitude, and priority of risks associated with distributed potential intrusions in a large scale system composed of many critical subnetworks, this paper will describe a framework for organizing, aggregating, and prioritizing risks to maintaining grid critical functionality.
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