Security Enhancement for Data Transmission in Mobile AD-HOC Networks

Mobile Ad-hoc Networks is one of the most popular and widely usable wireless technologies.  Among so many wireless standards, Ad-hoc technology won the favor of people because of its lower construction and operating costs, higher data rate, farther transmission distance and better extensibility, etc. But it can be less secure than wired connections because an intruder does not need a physical connection. So security is a key issue in data transmission through this network.  In this research work an integrated cryptographic scheme has been proposed to overcome the security problems and to enhance the security of Mobile Ad-hoc Network. This scheme is based on DES, RSA and Rijndael algorithm.  These three algorithms are used to generate the key to encrypt the data.  Among the three algorithms, Rijndael algorithm has variable block and key length.  Since the extension of blocks is possible in Rijndael algorithm, we can extend the block length and key length by multiples of 32bits in order to avoid the loss of data while transferring the biggest files.