Abstract
This paper deals with a two-key based novel approach for generating a permutation table that can be used in a symmetric cryptographic system to cause diffusion. It also discusses how the permutation table generated using the approach can be applied to character based encryption and binary data block produced at intermediate stages by symmetric cipher algorithms. It also describes the effect of our approach on characters of intermediate text as well as on bits of binary data block along with the impact of a single bit change in key information on producing permutation sequences applied to plaintexts to produce ciphertexts. The results are satisfactory and the proposed approach can be employed in any symmetric block cipher algorithm that uses the predefined permutation tables.
Highlights
The substitution and permutation processes play a very important role in causing confusion and diffusion in the text blocks being generated in various rounds of Feistel or SPN based ciphers
To develop better insight of the work, the terminology and concepts related to cryptography with respect to the work and the description of our algorithm for generating permutation table with a required size are presented
The modern design of block ciphers is based on the concept of an iterated product cipher
Summary
The substitution and permutation processes play a very important role in causing confusion and diffusion in the text blocks being generated in various rounds of Feistel or SPN based ciphers. Many of the symmetric block ciphers use identical rounds of substitution and permutation processes in each encryption round with a subkey generation function to generate a different round key for use in each round. A permutation p on S, finite set of elements, is a bijection from S to itself. If a function f : P → C is oneto-one and onto, f is called a bijection or one-to-one correspondence. A function f : P → C is oneto-one (injective) function if each element in P is related to a different element in C
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