Vehicular Adhoc NETworks (VANETs) is madeof dispersed roadside units (RSUs) and vehicles. The vehicles can send protection– related messages like speed, location of the motorvehicle, hazardous road conditions to any close by vehicles and tothe RSU and vice versa. In VANET, each vehicle broadcasts a message to nearbyvehicles and RSUs every few hundreds of milliseconds. A vehicle oran RSU may get hundreds of information in a short period. If the communicationcannot be processed in time, occurrence of traffic jams and accidents ispossible.
Hence, it is critical to devise security and privacy mechanisms thatnever lead to an unaffordable reaction delay. As the wireless communicationcontrol is a shared medium, exchanging information without anysecurity protection over the air can easily leak the information that users maywant to keep private. Pseudonym based schemes have been proposed to preserve thelocation privacy of vehicles.
However, those schemes require the vehiclesto store a huge amount of pseudonyms and certifications and will notsupport some important secure functionality such as authenticationand integrity. Existing secure and privacy – preserving protocols in VANETs arefast and does not depend on ideal tamper – proof devices embedded in thevehicles. This is a major concern when it comes to privacy. In this work, theanticipated protocol is based on a new multiple trusted authority one-timeidentity based, frequency and attribute – based aggregate signaturetechnique.
A vehicle is able to verify many messages at the same instanceand their signatures can be compressed as a solitary unit. Thisminimizes the storage space required by a vehicle or a datacollector to a considerable extend. A practical cooperative messageauthentication protocol is proposed to elevate theverification burden, where each vehicle just wants to verifya small quantity of messages. The particulars of likely attacks andthe equivalent solutions are also discussed. We further develop asystem methodical model for analyzing a variety of traffic information andcarry out NS2 simulations to inspect the key sharing delay and misseddetection ratio of harmful messages, with the proposed keymanagement framework.