Vehicular ad hoc networks (VANETs) are relegated as an application of mobile ad-hoc network (MANET) which encourages vehicles on road to impart for driving wellbeing. VANETs have been developed to turn the consideration of specialists in the area of wireless and mobile communication. VANETs endures security dangers as different systems, it is unmanageable to keep information secure and personal. Preserervation of security is a crucial necessity in VANETs. Vehicles are isolated to various groups for a protected end to end communication. Protection in group communication is preserved at the point when vehicles in same or diverse group impart to each other to share security and non-wellbeing related data, Cluster head should be culled from reliable nodes and also before being the trustworthy message ought to be signed and marked. Traffic encryption key (TEK) and key encryption key (KEK) is dispersed and managed to secure message in the group. To preserve authentication, privacy and integrity of data in group several group key management techniques in VANET have been developed. Here we are passing on previously developed different techniques to key management in VANET and their constituents.
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