Nonlinearity Improvement for Ascon Substitution Box

Document Type : Original Article

Authors

1 Air Defense College, Faculty of Engineering, Alexandria University, Egypt

2 Electrical Engineering Department, Faculty of Engineering, Alexandria University, Egypt

Abstract

The technological scene is developing towards employing tiny-sized devices. For a variety of functions that encompass sensing, identification, and decision-making. These devices are re-stricted in their resources to be secure. The National Institute of Standards and Technology (NIST) has published the Ascon, a standard lightweight cryptography (LWC) algorithm for data gath-ered by restricted devices in 2023. The fundamental function of Ascon is the permutation function. The main core of the permutation function is the substitution box (S-box). This paper proposes an S-box based on chaotic systems using coupled map lattices (CML), which agrees with LWC al-gorithms due to its low complexity. The proposed S-box suggests high performance and security for restricted devices. The security robustness is tested using various cryptographic criteria, such as nonlinearity, strict avalanche criteria, and differential approximation probabilities. The pro-posed S-box approaches significant resistance to both linear and differential cryptanalysis. So, it could be replacing the substitution and linear diffusion layers of Ascon permutation to improve the nonlinearity and randomness.

Keywords

International Journal of Telecommunications
Volume 04, Issue 01
February 2024
Pages 1-13

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