Generation of 8 × 8 S-boxes using 4 × 4 optimal S-boxes Online publication date: Tue, 07-Feb-2023
by Vikas Tiwari; Ajeet Singh; Appala Naidu Tentu; Ashutosh Saxena
International Journal of Information and Computer Security (IJICS), Vol. 20, No. 3/4, 2023
Abstract: Substitution boxes (S-boxes) have a very important role in the recent developments of block ciphers as it provides the nonlinearity for the ciphers. To resist different kinds of attacks, S-boxes must be constructed very cautiously. There are some schemes which are known to design S-boxes, interestingly these are based on evolutionary heuristics. In this paper, we have proposed a new approach for the construction of 8 × 8 S-boxes from the existing 4 × 4 S-boxes. We have used these 4 × 4 S-boxes in the design because of their good cryptographic properties. Evaluation of the proposed S-boxes properties is done by the SET Tool fa toolbox for S-box analysisg (Picek et al., 2014) and compared them with the S-boxes of mCrypton, Twofish, Kalynapi1, MD and Safer ciphers. The results show that the S-box generated by our approach has good cryptographic properties and these S-boxes can be used as one primitive for data encryption.
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