Published Paper Details:

In this paper, firstly an overview on MANET, their attacks, and encryption module are defined. In addition, a survey is carried out for MANET security. From, the survey found that AES is most used algorithm for data encryption as well as for key generation. The AES algorithm provides good security but not efficient in resource constraint devices. So, an Improved AES algorithm as an application for key generation for stream ciphers is proposed. In the Improved AES algorithm, by using Rijndaels substitution box and dynamic random shifting principle by reducing area and complexity as compared to AES, produced equivalent randomness. This paper introduces the concept of use of random initialization vector (IV) for resolving the replay attack on the network. The IV is randomly updated in each iteration and dependence of secret key on IV using nonlinear function producing the randomness of key. Moreover, based on NIST statistical analysis, it shows that more randomness is produced by proposed technique than A5/1 stream cipher.