A New Chaotic Memristor-Based Cryptosystem for Secure Bio-Signal Transmission on Low-Cost Hardware

Abstract

Motivated by the critical need for securing bio-signal transmissions in resource-constrained Internet of Medical Things (IoMT) devices, this paper proposes a novel lightweight cryptosystem based on a newly developed chaotic map called the Logistic-Coupled Memristor (LCM) map. This map is designed by coupling a discrete memristor with the well-known chaotic logistic map. The LCM exhibits a high degree of sensitivity to even slight changes in its ten control parameters, a crucial property for secure communication. We validate the chaotic behavior of the LCM using various established methods (Lyapunov exponents, bifurcation diagrams, parameter sensitivity analysis, and NIST randomness tests). Furthermore, we demonstrate its implementation on a low-cost microcontroller with limited resources. Building upon the LCM's properties, we propose a novel lightweight cryptosystem for securing the wireless transmission of bio-signals. This cryptosystem is also implemented on a low-cost embedded system, showcasing its potential for real-world applications. Extensive simulations and comparisons confirm that the LCM map retains its chaotic behavior even when implemented on resource-constrained microcontrollers. Additionally, the implemented cryptosystem achieves a high level of security with lower cost in comparison to existing solutions.