International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395 -0056 Volume: 03 Issue: 04 | April-2016 www.irjet.net p-ISSN: 2395-0072 © 2016, IRJET | Impact Factor value: 4.45 | ISO 9001:2008 Certified Journal | Page 2536 A Survey on Identity Based Batch Verification Scheme for Privacy and Security in VANET Pratabidya Mahapatra 1 , A.Naveena 2 1 MTech, Dept. of ETM, GNITS, Hyderabad, India 2 Assistant Professor, Dept. of ETM, GNITS, Hyderabad, India ---------------------------------------------------------------------***--------------------------------------------------------------------- Abstract - Vehicular adhoc network is an emerging network which facilitates vehicular communication for the safety requirements. Each vehicle broadcasts messages to its neighboring vehicle as well as to the roadside units(RSUs). However this increases the concerns for security and privacy. To check the message validity at RSU, a batch verification of all signed messages is being performed by RSU, which is known as Identity-based batch verification(IBV). In this scheme, messages should be signed and verified by RSUs without revealing the real identity of vehicles. This scheme assures anonymous authentication, message integrity , privacy as well as traceability. So in this paper, we present a survey of all the existing IBV schemes. Key Words: Anonymous identity, Authentication, Batch Verification, Privacy, Security, Vehicular adhoc Network 1.INTRODUCTION VANET provides a network where vehicles among the road communicate for driving safely. Vehicles are equipped with onboard unit(OBU),which communicates with other vehicles as well as roadside units(RSUs) located at street to increase the driving safety. So this communication refers Vehicles-to- Infrastructure (V2I) and Vehicle-to-Vehicle(V2V) communication. A trusted third party, known as Trusted Authority(TA), communicates with RSU by wired connection. TA is powered with sufficient storage and computational capability. So this network provides an efficient way to sense various physical signals to traffic distribution and collects various traffic information with more accuracy and low cost. This communication is basically governed by Dedicated Short Range Communications(DSRC) protocol. Each vehicle periodically broadcasts about its present state to its nearest vehicle and RSUs in every 100-300 ms. RSU verifies the messages to check its validity and also sometimes manages the traffic situation locally. As privacy is another important aspect, the real identity of the driver is not disclosed throughout the communication. Therefore an anonymous communication is maintained. In the case of dispute the real identity of driver is revealed by TA. Fig -1: The network model In order to increase the verification speed at RSUs, a bulk of messages is verified at the same time by RSU instead of verifying individually. This verification is known as Identity based Batch Verification(IBV). This drastically reduces the total verification delay. So this scheme should satisfy the following requirements in order to have security and privacy. 1.Message authentication: RSUs should be able to verify message, that is sent by legitimate vehicle without being modified. 2.Identity Privacy Preservation: The real identity of vehicle is kept anonymous from RSUs. 3.Traceability: The real identity of attacker should be retrieved by TA in the case of dispute. 2. LITERATURE SURVEY 2.1 An efficient Identity based batch verification scheme for Vehicular sensor network In the conventional signature scheme, the received message are verified one by one. So this may fail to satisfy the stringent time requirement of the vehicular communication applications. In order to tackle the above mentioned problems and make VSNs suitable for the intelligent traffic systems, Zhang et al proposed a scheme[1] which states that multiple signatures can be verified at the same time instead