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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.

The present work discloses the magnetohydrodynamic pulsating flow of blood-carrying nanoparticles in a channel with the viscous dissipation and Joule heating effects. Couple stress fluid is treated as blood which is the base fluid. The Maxwell Garnett model for thermal conductivity of nanofluid is considered. The thermal radiation and heat source/sink impacts are taken into account. Analytical expressions for dimensionless flow variables are obtained by employing the perturbation method. The impact of active parameters on flow variables is graphically presented. The obtained results show that the velocity of nanofluid increases with an increment in frequency parameter, whereas it decreases for a rise in Hartmann number, nanoparticles volume fraction and couple stress parameter. There is an enhancement in temperature of nanofluid with increasing viscous dissipation, whereas there is a decrease in temperature with an increase in the applied magnetic field. The Nusselt number rises with an enhancement in volume fraction of nanoparticles and Hartmann number at both the walls. Further, the validity of present results is assured by the comparison of analytical and numerical outcomes with an excellent harmony.

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