Plug-in electric vehicles (PEVs) reduce greenhouse gas emission by using power from the electric grid. PEVs are considered distributed energy resources and mobile storage devices, which require two-way communication standards to communicate with emerging Smart Grid infrastructure. Due to frequent mobility of PEVs, inter-utility real-time data communication is critical to the operation of interconnected systems in Vehicle-to-Grid (V2G) infrastructure. Interoperability and security considerations of V2G infrastructure components are decisive for widespread deployment of PEVs. In this paper, we propose multi-domain network architecture for V2G infrastructure which includes comprehensive hybrid public key infrastructure using hierarchical and peer-to-peer cross-certifications. We present system and performance analysis of the proposed security architecture.
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