DISTRIBUTED AGGREGATION OF ATTRIBUTED BASED SIGNATURE SCHEME FOR AUTHENTICATED COMMUNICATION IN VANET

Vehicular Ad hoc Networks (VANETs) consists of vehicles and distributed roadside units (RSUs). The vehicles can send safety related messages like speed, location of the vehicle, dangerous road conditions to any nearby vehicles and to the RSU and vice versa. In VANET, each vehicle broadcasts a message to nearby vehicles and RSUs every few hundreds of milliseconds. A vehicle or an RSU may receive hundreds of messages in a short period. If the messages cannot be processed in time, occurrence of traffic jams and accidents is possible. Hence, it is critical to devise security and privacy mechanisms that never lead to an unaffordable reaction delay. As the wireless communication channel is a shared medium, exchanging messages without any security protection over the air can easily leak the information that users may want to keep private. Pseudonym based schemes have been proposed to preserve the location privacy of vehicles. However, those schemes require the vehicles to store a large number of pseudonyms and certifications, and do not support some important secure functionality such as authentication and integrity. Existing secure and privacy preserving protocols in VANETs are fast and does not depend on ideal tamper proof devices embedded in the vehicles. This is a major concern when it comes to privacy.