Secure Authentication for Vehicular Ad Hoc Network

Security is an important issue in ad hoc networks, especially fo r security sensitive applicat ions. This paper main ly focus the authentication based on the group signature for providing the security and privacy in vehicular ad hoc networks (VANET). In VANETs, g roup signature is widely used for vehicles to achieve unauthenticated vehicles. A group signature scheme allows members of a group to sign messages on behalf of the group. Signatures can be verified with respect to a single group public key, but they do not reveal the identity of the signer When receiving a message from an unknown entity, a vehicle has to check the certificate revocation list (CRL) to avoid communicat ing with revoked vehicles and then verify the sender’s group signature to check the validity of the received message. The Public Key Infrastructure ensures user validity. It is based on the concept of asymmetric key cryptography. The security and performance analysis show that our scheme is more efficient in terms of authentication speed, while keeping conditional privacy in VANETs.