Secure Key Distribution for Vehicular Network Based on Kirchhoff Law Johnson Noise

In the ever-evolving landscape of vehicular networks, this article introduces an efficient shared key generation mechanism, utilizing the working principle of Kirchhoff Law Jonson Noise (KLJN). The proposed Multiple-Resistor KLJN scheme for vehicular networks utilizes a dedicated KLJN line to establish a secure connection between the certificate authority and the Road Side Units (RSUs) for generating and sharing secure keys. The proposed KLJN-based key distribution scheme eliminates the need for digital certificate verification, offering an unconditionally secure key exchange scheme. The lifetime of the secure key is a crucial parameter in the network, influenced by the Key Generation Rate (KGR) and the capacity of a single Road Side Unit (RSU) to handle vehicles. Our analysis demonstrates that the incorporation of modified KLJN circuitry significantly enhances the frequency of secure bit exchanges while simultaneously reducing the maximum lifetime limit of the KLJN key. This improvement leads to enhanced security levels without compromising the operational efficiency of the network.