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Preserving the privacy of the vehicle on the move is an important challenge in VANET's. Vehicles can be loaded with Pseudonyms that can be changed frequently in specific intervals to prevent tracking of the vehicle by a third party. Yet, this scheme supports only a short travel from home and moreover the RSUs' do not play a major role. Therefore, this paper proposes a scheme of implementing a security mechanism using Blind Signature, where the Road Side Units in collaboration with the Trusted Authority generates the keys to be transmitted to the vehicles. These short lived keys are used to send and receive messages on the roads. The paper considers two ideal places where the vehicle stops for some long time, one being the traffic signal and the other is a parking lot. The key update time for the two scenarios using Blind signature is compared with the earlier scheme where the vehicle changes its Pseudonym based on the neighbouring vehicle. The proposed approach has been evaluated using simulations in Ns-2.

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