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arXiv 2610.13367cs.CReess.SP
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前导中的秘密:面向Wi-Fi的实用且鲁棒的物理层信息隐藏技术

Secrets in Preamble: Practical and Robust PHY Information Hiding for Wi-Fi

Southeast University(东南大学);Nanjing University of Posts and Telecommunications(南京邮电大学);University of Liverpool(利物浦大学)

Rui Pan, Guanxiong Shen, Linning Peng, Xinyu Qi, Junqing Zhang

AI总结:

本研究针对现有Wi-Fi信息隐藏方法容量受限、鲁棒性不足的问题,提出在Wi-Fi L-STF中嵌入秘密的神经网络方法,经实验验证可可靠嵌入46比特秘密,提升了容量与鲁棒性。

摘要:

物理层(PHY)信息隐藏指在不损害主通信链路完整性的前提下,将秘密信息隐藏在物理层波形中,可用于隐蔽通信、物理层隐写术和水印等关键应用。Wi-Fi的广泛部署促使大量研究关注在Wi-Fi波形中隐藏秘密信息,但现有Wi-Fi信息隐藏方法存在两个局限:隐写容量受限、对环境变化的鲁棒性不足,严重制约了实际部署。本研究提出在Wi-Fi传统短训练字段(L-STF)中嵌入秘密信息,所设计的方法保留了Wi-Fi L-STF的自相关特性,确保包检测和粗频偏补偿功能不受影响。秘密嵌入与提取过程采用一对神经网络,用于学习最优嵌入规则并最大化隐写容量。我们开发了原型系统,并在室内和室外环境中开展了全面实验,结果表明,该方法可在不同信道条件下,于Wi-Fi包中可靠嵌入46比特秘密信息,实现了显著提升的隐写容量和环境鲁棒性,硬件原型研究验证了所提Wi-Fi信息隐藏方案的可行性。

英文摘要:

Physical layer (PHY) information hiding refers to the concealment of secrets within PHY waveforms without compromising the integrity of the primary communication link, thereby enabling critical applications such as covert communication, PHY steganography, and watermarking. The widespread deployment of Wi-Fi has motivated substantial research interest in hiding secrets within Wi-Fi waveforms. However, existing Wi-Fi information hiding approaches suffer from two limitations: restricted steganographic capacity and insufficient robustness against environmental variations, both of which severely constrain practical deployment. This work proposes to embed secrets within the Wi-Fi legacy short training field (L-STF). The designed method preserves the autocorrelation properties of Wi-Fi L-STF, ensuring that packet detection and coarse frequency offset compensation functionalities remain uncompromised. The secret embedding and extraction processes employ a pair of neural networks designed to learn optimal embedding rules and maximize steganographic capacity. We developed a prototype system and conducted comprehensive experiments across both indoor and outdoor environments. Experimental results show that our method can reliably embed 46 secret bits within Wi-Fi packets across diverse channel conditions, achieving significantly enhanced steganographic capacity and environmental robustness. The hardware prototype study validates the feasibility of the proposed Wi-Fi information hiding scheme.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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