Secure and Efficient Certificateless Authentication Key Agreement Protocol in VANET

An authentication key agreement protocol is designed to realize mutual verification and generate symmetric key shared by participants in symmetric cryptosystem. Aiming at the security problem of an authentication key agreement protocol using certificateless aggregate signature in VANET, an improved certificateless authentication key agreement protocol based on elliptic curve is proposed, and then the security of the protocol is analyzed. The analysis results show that the protocol can make up for the security loopholes of the existing schemes, meet the resistance to temporary secret key leakage, resistance toman-in-the-middle attack, the forward security, anti-impersonation attack and other security properties. Compared with the security and efficiency of congener schemes, this scheme provides higher security at the same time has the same operation efficiency of original scheme, which can be used conveniently in resource-constrained VANET.