A Pre-signature Scheme for Trustworthy Offline V2V Communication

Vehicle-to-Vehicle (V2V) communication systems hold great potential for enhancing road safety and traffic efficiency. The authentication of such communication is crucial, particularly in scenarios where infrastructure is absent, while also ensuring the privacy of the participating vehicles. The Security Credential Management System (SCMS) offers a solution using pseudonym certificates. The pseudonymous nature of V2V communication poses a challenge to integrating reputation of vehicles. We propose a novel solution that allows reputation to be used even when vehicles are pseudonymous and without access to a reputation server. By extending SCMS with a reputation system, vehicles can securely retrieve and update their reputation from a dedicated server, resulting in improved effectiveness of offline V2V communication. To achieve this, we propose a two-step signature scheme variant called Pre-Signature. This scheme enables an appropriate balance between reputation and pseudonymity in offline V2V communication. It increases message size by approximately 0.5 kilobytes while ensuring efficient offline operation and secure communication, with minimal computational overhead for signing and verification operations.