Smart Certificate Revocation List Exchange in VANET

Abstract

Communication among vehicles should be secure and safe. Any vehicle or node that misbehaves or transmits wrong information needs to be revoked. One of the widely used scheme to revoke the malicious node's certificate is a public key infrastructure (PKI). In PKI Certificate revocation list (CRL) is issued by the Certificate Authority (CA). CRL is distributed in the system after its creation by the CA. All the vehicles must receive a genuine copy of CRL so that they can stop receiving messages from malicious nodes. CRL should be distributed very fast and efficiently in the VANET system. We propose a new method for CRL distribution called Smart Certificate Revocation List Exchange (SCRLE). Both V2V and V2I communication is used by our method to distribute CRL pieces among the vehicles. Our method is inspired by C2CEpidemic method of CRL distribution and uses the idea of sharing the CRL list in peer to peer manner. With this approach, vehicles will be able to find their peers more appropriately. This approach uses a ranking mechanism by which vehicles will be paired with those vehicles which have more number of CRL pieces. This will increase the chance of exchanging of CRL pieces efficiently. OMNET++ along with Vein s framework is used to implement and evaluate the method. Sumo is used to generate traces of vehicles for large scale simulation. Results show that it performs better than C2CEpidemic method of CRL exchange.