Abstract: Now a day, Vehicular Ad-hoc Networks (VANET) are becoming more popular as the accident statistics increase. VANET simply provides many safety applications to save people lives while driving on road, It also eliminate accidents and damage to the vehicles and people. VANET also save our time by providing information about busy traffic on ongoing road. But on the other hand we should also consider some of the security related issues such as privacy of drivers including location and identifier information should be preserved in the network. So for preventing many of attacks and also preserving privacy of drivers, many protocols need an infrastructure for key distribution, revocation and secure exchange of the messages containing private information. For providing secure communication here using various cryptography based methods. Some security mechanisms used for encrypting and authenticating V2V and V2I messages comes with overhead in terms of computation and communications between the vehicles. Therefore, in order to increase the feasibility and better performance of cryptographic based protocols, we should have to investigate operation of different cryptography based methods. Due to high mobility nodes in the network or high speed vehicles we need to select appropriate cryptographic method that should have a very little processing time, have a small key length, small of length of created message as much as possible and have an acceptable level of safety over the key lifetime. In this survey paper, system described various cryptographic algorithms such as RSA, Elliptic Curve Cryptography, and Message Digest 5(MD5) with their pros and cons. They provide better security and privacy if we use combination of this algorithm. In this survey work, briefly described the comparison between the RSA and ECC.
Keywords: Elliptic Curve Cryptosystem, Elliptic Curve Integrated Encryption Scheme, MD5, RSA.