Dyadic-Chaotic Lifting S-Boxes for Enhanced Physical-Layer Security within 6G Networks

TL;DR

This paper introduces a novel chaos-based, reconfigurable S-box for physical-layer security in 6G networks, providing lightweight, dynamic, and secure confusion components to enhance resistance against cryptanalysis and precomputation attacks.

Contribution

It presents the first chaos-lifted, seedable, time-varying S-box design that combines dynamical systems with dyadic sampling for enhanced physical-layer security.

Findings

Achieves uniformity and full bijections with ergodic properties.

Provides high nonlinearity and algebraic degree for cryptographic strength.

Demonstrates resistance to algebraic and linear cryptanalysis.

Abstract

Sixth-Generation (6G) wireless networks will interconnect billions of resource-constrained devices and time-critical services, where classical, fixed, and heavy cryptography strains latency and energy budgets and struggles against large-scale, pre-computation attacks. Physical-Layer Security (PLS) is therefore pivotal to deliver lightweight, information-theoretic protection, but still requires strong, reconfigurable confusion components that can be diversified per slice, session, or device to blunt large-scale precomputation and side-channel attacks. In order to address the above requirement, we introduce the first-ever chaos-lifted substitution box (S-box) for PLS that couples a $\beta$-transformation-driven dynamical system with dyadic conditional sampling to generate time-varying, seedable 8-bit permutations on demand. This construction preserves uniformity via ergodicity, yields full 8-bit bijections, and supports on-the-fly diversification across sessions. The resulting S-box attains optimal algebraic degree 7 on every output bit and high average nonlinearity 102.5 (85% of the 8-bit bound), strengthening resistance to algebraic and linear cryptanalysis. Differential and linear profiling report max DDT entry 10 (probability 0.039) and max linear probability 0.648, motivating deployment within a multi-round cipher with a strong diffusion layer, where the security-to-efficiency trade-off is compelling. Our proposed reconfigurable, lightweight S-box directly fulfills key PLS requirements of 6G networks by delivering fast, hardware-amenable confusion components with built-in agility against evolving threats.