A Survey on Secure Intelligent Transportation System Protocol for VANET using SMAP

-A vehicular ad hoc network (VANETs) provides the security through the Public Key Infrastructure (PKI) and Certificate Revocation Lists (CRLs). In any PKI system, the signature of sender and certificate should be verified in CRL list. Also verifying the certificate of the sender then authentication is provided to received message. In this paper ,signcryption message authentication protocol (SMAP) combines digital signature and encryption functions. It not only provides message confidentiality, authentication, integrity, and nonrepudiation, but also forward secrecy for message confidentiality and public verification. In addition, SMAP uses a novelprobabilistic key distribution, which enables non-revoked OBUs to securely share and update a secret key. SMAP can significantlydecrease the message loss ratio due to the message verification delay compared with the conventional authentication methods employing CRL. By conducting security analysis and performance evaluation, SMAP is demonstrated to be secure and efficient.