A Key Selected S-Box Mechanism and Its Investigation in Modern Block Cipher Design

Jiqiang Lu, Hwajung Seo
<span title="2020-05-26">2020</span> <i title="Hindawi Limited"> <a target="_blank" rel="noopener" href="https://fatcat.wiki/container/sdme5pnua5auzcsjgqmqefb66m" style="color: black;">Security and Communication Networks</a> </i> &nbsp;
The block cipher is an important means to provide data confidentiality in reality, and the S-box is an essential part in most of modern block cipher designs. In 1973, Feistel used a key selected S-box mechanism in his early block cipher designs, whose idea is to let each S-box have two different states and use a key bit to select which of the two states is to be used in an encryption or decryption operation. However, this key selected S-box mechanism has not got much attention in modern block
more &raquo; ... pher design with the DES block cipher published in 1977. In this paper, we revisit Feistel's key selected S-box mechanism, give a generalised version of Feistel's key selected S-box mechanism, compare it with existing close notions, and design the LBC example cipher to demonstrate that the generalised key selected S-box mechanism can be advantageous over the ordinary S-box mechanism in modern block cipher design for improving security and/or performance without intensifying computational effort and space in some application environments.
<span class="external-identifiers"> <a target="_blank" rel="external noopener noreferrer" href="https://doi.org/10.1155/2020/1457419">doi:10.1155/2020/1457419</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/4kvwfd2vmffdzp2gcanweemt4q">fatcat:4kvwfd2vmffdzp2gcanweemt4q</a> </span>
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