Abstract—Vehicular Ad hoc Network is basically the solution of several problems associated while vehicles are plying on the road. In this paper, we have focused on the detection of imposter node while it has stolen the ID's of the authenticated vehicle in the network. The purpose is to harm the network through imposter messages. Here, we have proposed a protocol namely Imposter Detection based on Location (IDBL), which will store the location coordinate of the each vehicle as the key of the authenticity of the message so that imposter node can be detected. The imposter nodes send messages from a stolen ID and show that it is from an authentic node ID. So, to detect this anomaly, the first location is checked and observed different from original vehicle location. This node is known as imposter node. We have implemented the algorithm through JAVA and tested various types of node distribution and observed the detection probability of imposter node. Keywords—Authentication, detection, IDBL protocol, imposter node, node detection. I. INTRODUCTION HE intelligent transportation system always helps human being for safer travel and as well as economic development globally. Heavy road traffic is one of the major problems faced worldwide. Thus to deal with traffic situation, safety etc. on road in transportation system there is a new innovation called VANET which has brought a revolutionary change in the transport system. VANET (Vehicular Ad-hoc Network) is a sub-category of MANET (Mobile Ad-hoc Network). The communication is established through wireless medium among Vehicles to Roadside Units (RSUs) and Vehicle-to-Vehicle. The VANET primarily focuses on safety concern and improved traffic condition by establishing an environment that promotes inter- vehicular communications (V2V) and vehicles to Infrastructure (V2I) communications regarding road related concern such as accidents, road traffic routing etc. [1]. Each node within the VANET networks is equipped with wireless devices for information exchange. The VANET plays a vital role in improving the situation of traffic related issues, finding correct route, know traffic situation in advance. This needs the prior knowledge of the situation around the vehicles. A VANET is a self-organized network that can be formed by connecting vehicles, aiming to improve the security and privacy and traffic control with internet access by the drivers. Sanjoy Das, Associate Professor, is with the School of Computing Science and Engineering, Galgotias University, India (e-mail: sdas.jnu@gmail.com). Akash Arya is with the Galgotias University, (e- mail:akash4arya5@gmail.com). Rishi Pal Singh is with the Guru Jambheshwar University of Science and Technology, Hisar, India (e-mail:pal_rishi@yahoo.com) A simple scenario of VANET is shown in Fig. 1. The world health organization data show that nearly 1.2 million people are killed every year due to road accidents [4]. So with the help of this application, we are able to reduce the road accidents and save human lives. For establishing a VANET, IEEE has defined the standard 802.11p or 802.16 (WiMax) [1]. The dedicated short range communication is operating on 5.9 GHz and it uses IEEE 802.11 access methods for communication. The DSRC creates a new kind of communication application which increases overall security, privacy, efficiency or safety of the transportation system [2]. ITS is the future of transportation system. VANETs are a temporary network with no fixed infrastructure, no wired communication between vehicles. It is a collection of multiple nodes and nodes have a duty to forward the message, maintain a routing table and secure their resource from imposter attackers. It is used for the short time communication. In VANET, vehicles may establish communication via vehicle- to-vehicle (V2V) or Vehicle-to-Infrastructure (V2I). There are many challenging issues as authentication of any new vehicles, how to detect any imposter vehicles, how to establish secure communication among the vehicles etc. [8]. In this network, message received from another vehicle should be authenticated because some of the vehicles may misbehave in the network and may create a congestion or may possible broadcast false information for their own advantages over the other vehicles. In this paper, we have developed a protocol known as IDBL. It helps to authenticate and detection of imposters in the network. This technique establishes a secure communication among vehicles. Fig. 1 Simple scenario of VANET Sanjoy Das, Akash Arya, Rishi Pal Singh Imposter Detection Based on Location in Vehicular Ad-Hoc Network T World Academy of Science, Engineering and Technology International Journal of Computer and Information Engineering Vol:11, No:6, 2017 804 International Scholarly and Scientific Research & Innovation 11(6) 2017 ISNI:0000000091950263 Open Science Index, Computer and Information Engineering Vol:11, No:6, 2017 publications.waset.org/10008549/pdf