Physical layer encryption based on digital chaos in THz wireless communication

IF 2.6 3区计算机科学 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

Optical Fiber Technology Pub Date : 2025-01-10 DOI:10.1016/j.yofte.2024.104118

Qinghui Chen , Cong Peng , Li Zhao , Weihao You , Hong Wen , Jianshe Li

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Abstract

In this paper, we propose and implement a digital chaos-based encryption scheme that enhances the security of free space communication in a photonics-assisted terahertz wave (THz-wave) wireless data transmission system operating at 340 GHz. We experimentally demonstrate that the delivery of traditional and encrypted 16 Gbaud 16QAM-OFDM and PS-64QAM-OFDM (5.5 bit/symbol) signals over 20 km of standard single mode fiber (SSMF) and a wireless distance 25/54 m. The bit-error ratio (BER) performance of each signal meets the soft-decision forward-error-correction (SD-FEC) threshold of 4.2 × 10⁻². The experimental results show that the encryption scheme does not degrade the performance of the OFDM signals. Furthermore, we analyze the encryption algorithm’s security based on Kerckhoff’s principle, which states that a tiny deviation from the correct keys would make the eavesdropper unable to obtain useful information, and the BER would remain around 0.5. The proposed encryption scheme based on a digital three-dimensional multi-scroll chaotic system, has a huge key space of size 2¹⁴⁵ bits, which can effectively prevent exhaustive key-search attacks.

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太赫兹无线通信中基于数字混沌的物理层加密

在本文中，我们提出并实现了一种基于数字混沌的加密方案，该方案增强了工作在340 GHz的光子辅助太赫兹波（THz-wave）无线数据传输系统中自由空间通信的安全性。我们通过实验证明了传统和加密的16 Gbaud 16QAM-OFDM和PS-64QAM-OFDM（5.5比特/符号）信号在20公里的标准单模光纤（SSMF）和25/54米的无线距离上的传输。每个信号的误码率（BER）性能满足SD-FEC （soft-decision forward-error-correction）阈值4.2 × 10−2。实验结果表明，该加密方案不会降低OFDM信号的性能。此外，我们基于Kerckhoff原理分析了加密算法的安全性。Kerckhoff原理指出，与正确密钥的微小偏差将使窃听者无法获得有用的信息，并且误码率将保持在0.5左右。提出的加密方案基于数字三维多涡旋混沌系统，具有2145位的巨大密钥空间，能够有效防止穷举式密钥搜索攻击。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Optical Fiber Technology 工程技术-电信学

CiteScore

4.80

自引率

11.10%

发文量

327

审稿时长

63 days

期刊介绍： Innovations in optical fiber technology are revolutionizing world communications. Newly developed fiber amplifiers allow for direct transmission of high-speed signals over transcontinental distances without the need for electronic regeneration. Optical fibers find new applications in data processing. The impact of fiber materials, devices, and systems on communications in the coming decades will create an abundance of primary literature and the need for up-to-date reviews. Optical Fiber Technology: Materials, Devices, and Systems is a new cutting-edge journal designed to fill a need in this rapidly evolving field for speedy publication of regular length papers. Both theoretical and experimental papers on fiber materials, devices, and system performance evaluation and measurements are eligible, with emphasis on practical applications.