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SIEGate (the Secure Information Exchange Gateway pronounced Psy-gate) exists to (1) improve the security posture and minimize the external cyber-attack surface of electric utility control centers, and (2) to reduce the cost of maintaining current control-room-to-control-room information exchange. ... [More] SIEGate implements a true publish-subscribe architecture where the sending gateway owner authorizes data as available for subscription by specific consuming gateways. Once authorized, the consuming gateway discovers the data that has been made available to it by other SIEGate nodes and allows selective subscription. Data made available for publication and subscription by SIEGate includes measurements, such as SCADA or synchrophasor data, files, notifications and alarms. [Less]