Attack-Resistant Chaotic Communication System in Non-ideal Physical Channel

Chaos and Fractals is a peer-reviewed interdisciplinary journal dedicated to advancing the understanding and application of chaos theory and fractal geometry across various scientific disciplines. The journal serves as a nexus for researchers, mathematicians, physicists, engineers, and practitioners to disseminate cutting-edge research findings, innovative theories, and practical applications in the realm of chaos and fractals. The journal aims to foster interdisciplinary collaboration and facilitate the exchange of ideas among researchers and practitioners working in the fields of chaos theory and fractal geometry. We welcome contributions that explore theoretical developments, computational methods, experimental observations, and practical implementations related to chaos and fractals.

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Coherent chaos-based communication is a developing technique for secure data transmission based onsynchronization of chaotic oscillators at the transmitter and receiver sides, which is treated as a more securemethod than non-coherent communication, chaotic symbolic dynamics, and other approaches. Nowadays,digital implementation of such systems allows high precision in parameter matching and sophisticated messagerecovery algorithms, though challenges remain: first, in adapting chaotic signals for non-ideal physical media,e.g., acoustic channels with frequency-dependent attenuation and noise, while, second, still providing the highlevel of security. The current study provides the implementation of a coherent chaotic communication systembased on the Sprott Case S chaotic oscillator that meets these challenges. We utilize the modulation technique,minimizing changes in chaotic dynamics that may be captured by an intruder, propose an optimization ofchaotic oscillator parameters to match channel characteristics and establish a signal normalization procedureto neutralize attenuation at the receiver side. Applying spectral and return map attacks, we show that themeasures taken to counteract distortion in the path do not reduce the security of the transmission. In anexperiment with a physical acoustic path, we demonstrate the practical operability of our approach.