A Modified RSA Cryptography Algorithm for Security Enhancement in Vehicular Ad Hoc Networks

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Secure the communication over network is an important task. Security of Vehicular Ad hoc Networks (VANET) is prime concern due to the numbers of attacker’s existence. We can protect information by using different cryptography methods. The Rivest–Shamir–Adleman (RSA) is one of the asymmetric key cryptography systems to protect information. In asymmetric key cryptography system from the generated key pair, one key is used for information to encrypt and the another key is used for information to decrypt. In RSA, the value of n is computed through the multiplication of two prime numbers p and q. If the factors of n can be found by the intruder using brute force attack, therefore, the security level will reduce. In this paper, we proposed a modified RSA algorithm called MRSA with three prime numbers j, k, and l for VANETs to increase the level of security in vehicular communication. RSA algorithm is with one more prime number, i.e., three prime numbers are used rather than two prime numbers, for increasing the brute force attack time. The lifetime of a message in VANETs may be less. Therefore, MRSA may provide us better result by enhancing the level of security with small key size. The experimental results and analyses are shown for both the RSA and MRSA cryptography algorithms.