The vehicular ad-hoc network is a kind of mobile ad-hoc network which contains mobile nodes on board unit and roadside units by using this three thing this network start communication. Vehicles are communicated to each other, a speed of vehicles are high so that topology of this network changed frequently. One of the main issues of this network is by maintaining the topology of vehicles so that communication between vehicles going too fast, the second issue of vehicles network is security. In this paper we propose a k-means based cluster formation technique by which dynamically we maintain reformation of clusters after that we choose trusted authority as a cluster head so that secure transmission going on. Preventing network by attack we use hashing technique in which vehicle encrypt the data by hash function, the novelty of our proposed work we proof by our results.
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