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In this paper, the authors introduce a novel security architecture and security mechanisms for vehicular networks environments. Their approach provides a layer-2 multi-hop authentication and credential delivery scheme between vehicles and the network operator authentication server. They analyze the performance of the proposed solution through extensive simulations, showing the success of their scheme (compared to the legacy single-hop scheme) in providing a robust and efficient authentication and credential delivery to vehicles. Based on the obtained performance analysis, they derive some guidelines aiming to optimize their solution under various vehicles densities.
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