What question did this study set out to answer?

This study aims to develop a symbol-level encryption method using coupled chaotic maps to enhance security in Fiber-THz communication systems.

June 12, 2026Open Access

Symbol-Level Physical-Layer Encryption Driven by Coupled Chaotic Maps for Fiber-THZ Integrated Links

ZYZufang YangWuhan Technology and Business University DWDongfei WangNanchang Institute of Technology SZS ZhouFuyang Normal University

Key Points

This study aims to develop a symbol-level encryption method using coupled chaotic maps to enhance security in Fiber-THz communication systems.
Proposed a dual-chaos encryption scheme coupling Logistic and Arnold Cat maps.
Performed 200 rounds of joint iteration and key generation with spatiotemporal correlation feedback.
Reduced bit error rate (BER) for legitimate users to below the 3.8×10^-3 threshold over ~124 km of single-mode fiber.
Legitimate-user BER maintained below 3.8×10^-3 up to 124 km of fiber, while eavesdropping BER remained near 0.5.
Key space achieved approximately 2^186 with successful NIST SP 800-22 test results.
Maximum Lyapunov exponent remained positive, indicating robust encryption security.

Abstract

To counter passive eavesdropping in the open-air Terahertz segment of 6G Fiber-THz-Fiber links, we propose a symbol-level dual-chaos encryption (DCE) scheme coupling a Logistic map with an Arnold Cat map.Through 200 rounds of joint iteration, multi-digit extraction-concatenation-normalization, and spatiotemporal correlation feedback extension, uniformly distributed [0, 1) keys with suppressed adjacent-symbol correlation are generated.The key stream drives quadrature phase-shift keying phase rotation entirely within the transmitter's digital signal processing, leaving the optical-THz interface intact.On a 360-430 GHz photonic heterodyne platform with 3 m wireless span, the legitimate-user BER stays below the 3.8×10 -3 hard-decision forward error correction threshold up to ~124 km of single-mode fiber, while eavesdroppers remain pinned near 0.5.The key space reaches ~2186 , the stream passes the full NIST SP 800-22 suite, and the maximum Lyapunov exponent stays positive across the operational region.DCE thus offers a lightweight, quantitatively assessable physical-layer security pathway for 6G optical-THz convergence.

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Yang et al. (Thu,) studied this question.

synapsesocial.com/papers/6a2ba18c8101cf8926f00f53 https://doi.org/https://doi.org/10.3116/16091833/ukr.j.phys.opt.2026.04001

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