Abstract: Due to the fact that existing V2G (Vehicle-to-Grid) authentication schemes fail to consider the mobility characteristics of vehicles, they are unable to effectively complete the cross-domain authentication process when cross-domain vehicles communicate and interact with grid servers in different regions. Additionally, when vehicles arrive at their destination domain for cross-domain authentication, they need to communicate frequently with the server in their registered domain, resulting in inefficient cross-domain authentication. To address these issues, a V2G cross-domain mutual authentication scheme based on Chebyshev chaotic map is proposed. In the proposed scheme, firstly, the physical security of the aggregator is quickly verified, and a temporary session key between the aggregator and the grid server is negotiated to complete the first layer of authentication, ensuring the confidentiality of information transmission during node queries on the blockchain. The second layer of authentication between the aggregator and the cross-domain vehicle is completed using authentication parameters stored on a smart card, which optimizes the cumbersome communication process between the vehicle and the aggregator in the registered domain and further reduces communication overhead. Theoretical analysis and experimental results demonstrate that the proposed scheme can achieve secure and efficient cross- domain authentication.

Key words: vehicle to grid, Chebyshev chaotic map, cross-domain authentication, consortium blockchain