Available Online at www.ijcsmc.com International Journal of Computer Science and Mobile Computing A Monthly Journal of Computer Science and Information Technology ISSN 2320–088X IJCSMC, Vol. 2, Issue. 8, August 2013, pg.70 – 75 RESEARCH ARTICLE © 2013, IJCSMC All Rights Reserved 70 AIM OF PROTECTED ROUTING MESSAGE AUTHENTICATION PROTOCOL FOR VEHICULAR AD HOC NETWORKS R. UmaSaraswathi 1 , N. Kavitha 2 , G. KesavaRaj 3 1 Research Scholar, Department of Computer science, Vivekanandha College, Elayampalayam, Tiruchengode-637205, India 2 Research Scholar, Department of Computer science, Vivekanandha College, Elayampalayam, Tiruchengode-637205, India 3 Assistant Professor, Department of Computer Application, Vivekanandha College, Elayampalayam, Tiruchengode-637205, India 1 umaraj.tg@gmail.com; 2 msckavithan@gmail.com; 3 kesavaraj@gmail.com Abstract— Vehicular ad hoc networks (VANETs) recognize the Public Key Infrastructure (PKI) and Certificate Revocation Lists (CRLs) for their safety. In some PKI system, the certification of a predictable message is performed by examination if the certificate of the sender is included in the current CRL, and verifying the genuineness of the certificate and signature of the sender. In this paper, we recommend an Aim of protected Routing Message Protocol for VANETs, which replaces the lengthy CRL examination route by an efficient revocation checking process. The revocation check process in PRMAC uses a keyed Hash Message Authentication Code ð PRMAC, where the key used in calculating the PRMAC is shared only between non revoked On-Board Units (OBUs). In addition, PRMAC uses a novel probabilistic key delivery, which enables non revoked OBUs to securely share and update a secret key. PRMAC can extensively reduce the message loss ratio due to the message verification delay compare with the traditional authentication method employing CRL. By perform security analysis and presentation evaluation, PRMAC is confirmed to be protected and resourceful. Key Terms: - Certificate Revocation; Communication Security; Hash Message; Message Authentication; Vehicular Networks I. INTRODUCTION The Vehicular Ad Hoc Network (VANET) has received considerable attention in current years, and the related principles and applications [1][2] are promote in many countries. The VANET provides both Roadside- to-Vehicle Communication (RVC) and Inter-Vehicle Communication (IVC). VEHICULAR ad hoc networks (VANETs) have scared broad kindness newly as a promise technology for change the transportation systems and providing broadband communication services to vehicles. VANETs consist of entities including On-Board Units (OBUs) and transportation Road-Side Units (RSUs). Vehicle-to-Vehicle (V2V) and Vehicle-to- Infrastructure (V2I) infrastructure are the two basic communication modes, which, respectively, allow OBUs to communicate with each other rand with the infrastructure RSUs.