SyNORM: Symmetric Non Repudiated Message Authentication in Vehicular Ad hoc Networks

In this paper, a secure and efficient message authentication protocol is introduced which uses a combination of digital signature and symmetric key encryption to support message integrity, authentication, and non-repudiation in VANETs. In this model a new role for the RSU is defined for verifying the authenticity of messages sent from vehicles and for notifying the results back to vehicles. Extensive simulations are conducted to validate that the proposed scheme outperforms the protocols that are solely rely on the public key infrastructure for message authentication and non-repudiation.