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This paper presents a new strategy for computer network security authentication of power system operations. Recently operations of electricity power distribution systems have become fairly complex due to introduction of distributed generations and microgrids, execution of open access competition, increased use of network-controlled devices, etc. Computer network therefore turns into a key integral of modern power-grid operations. This paper proposes a new utility computer network security authentication of requests for actions / commands in the smart-grid operations. The authentication covers multiple security domains in a new security architecture designed for smart power grids. This paper presents the strategy and platform of security authentications of requests for operations in the host area electric power system (AEPS) and interconnected multiple neighboring AEPS. Case studies of the new security authentication for smart grids operations are presented.