In vehicular Ad hoc Networks, the privacy protection is one of the major requirements. Since there are huge number of vehicles on our highways and city roads there must be possibility of attacks. To protect the privacy of vehicles, one solution is to hide the vehicle's identity with the use of pseudonym keys (i.e, temporary identities). Each vehicle uses its pseudonym key to communicate with other vehicles and road side units. The main effort of this work is to provide a solution towards privacy protection in vehicular Ad hoc Networks. Initially, we view vehicular ad hoc networks having non-overlapping sub networks referred to be a cell. Each cell with small geographic area having a pseudonym server which generates a list of pseudonyms using capacity planning algorithm. The Diffie Hellman Key Exchange scheme is also used to increase privacy protection. Our another effort is to reduce the routing overhead by using Hybrid Location based Ad hoc Routing (HLAR) protocol for routing pseudonyms and further communication. The accurate results are obtained and the performance is compared with reactive by detailed simulations.
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