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As Vehicular networks become popular, it will provide the communication between Vehicle To Vehicle (V2V) and between Vehicles To Road side unit (V2R). Security is the main issue in VANET. As there are many aspects to improve security in VANET, but still security remains the delicate research. In this paper two methods have been proposed for maintaining the security. One method is Combo algorithm and other method is the Global System for Mobile computing (GSM) technique. The objective of combo algorithm is to achieve the principle of confidentiality, integrity, authentication and non-repudiation.
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