COOPERATIVE MESSAGE AUTHENTICATION AND RESISTING FREE RIDING ATTACKS IN VANETS

P.Shilpa, Rajkumar B Patil

Abstract: A Vehicular Ad-Hoc Network (VANET) achieving its excellence when road safety, its efficiency and also enhancement in driving experience come into consideration. The road safety and efficiency can be accomplished by using the applications that communicate from one vehicle to another i.e., intercommunicating vehicles, emergency brake warning; however, if privacy and security issues are not considered, the captivating features of VANETs causes unpreventable risks for abuse. Information reliability, namely data integrity and authenticity can be achieved by a common tool known as message authentication, which faces a challenge in VANETs. If large number of messages are received by a vehicle, it becomes exhaustive (per-message) authentication may cause some extravagant computational overhead on the vehicle, and hence applications that are time critical suffers from unacceptable delay, such as accident warning and therefore in this concept introducing a cooperative authentication scheme for VANETs. This scheme eliminates unnecessary authentication attempts on the same message by different vehicles at a maximum which reduces the overhead caused by authentication on an individual vehicle, and shortening the authentication delay. This concept uses a token evidence approach that control authentication workload but without a trusted authority’s(TA) direct involvement which further resist numerous attacks, including freeriding attacks set by selfish vehicles, and promote cooperation. Vehicle passing a Road-Side Unit (RSU) obtains an evidence token via the RSU from the Trusted Authority. This token represents the contribution that the vehicle has made to cooperative authentication in the past, and thus enabling a vehicle to get convenience from other vehicles’ authentication attempts in the future, and hence its workload is reduced. Through this substantial simulation, the main goal is of saving workload, and resisting free-riding attacks

Keywords: Vehicular ad hoc networks; cooperative authentication; free-riding attacks; selfishness

DOI: https://doi.org/10.15623/ijret.2015.0417029