A novel symmetric block cipher algorithm based on two-key dependent permutation

Abstract

This paper proposes a design of symmetric block cipher algorithm using key-dependent permutations. The main objective is to develop a robust symmetric encryption algorithm resistant to linear and differential attacks. The design resembles Fiestel structure but uses dynamically generated permutation and substitution tables in each round during encryption process to achieve good confusion and diffusion. Plain texts of various sizes are subjected to the algorithm 1984 Arulmani Kuppusamy et al. and the results obtained show that the algorithm produces a good avalanche effect. The avalanche effect is more when there is a single bit change in key applied to the same plain text as compared to a bit change in plain text for the same key.