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Vehicular networks are the promising approach to provide safety to the drivers. It becomes a
key component of intelligent transport system. A lot of research work has been done towards it
but security issue got less attention. In this article we discuss about the VANET, it's technical
and security challenges. We also discuss some major attacks and solutions that can be
implemented against these attacks. We compare the solution on different parameters and lastly
discuss the mechanisms that are used in the solutions.