利用反馈码实现无线窃听信道下的安全通信，突破无反馈时的零保密容量瓶颈。
Feedback Lunch: Learned Feedback Codes for Secure Communications
- 设计基于学习反馈的模块化编码，结合通用哈希保障安全性。
- 反馈使合法双方可协商共享密钥，抵消窃听者的优势。
- 适用于感知辅助的安全通信场景，尤其适合通感一体化系统。
我们研究反向退化的安全通信信道，若无信道反馈，则保密容量为零。针对带有信道输出反馈的块衰落高斯窃听信道，提出一种基于种子的模块化编码设计，结合通用哈希函数保证安全性，利用学习型反馈编码提升可靠性。研究了通信可靠性与信息泄露之间的权衡，表明反馈能使合法双方达成共享密钥，从而克服窃听者的安全优势。研究结果为通感一体化（ISAC）背景下的感知辅助安全通信提供了编码设计启示。
原文摘要 · Abstract (English)
We consider reversely-degraded secure-communication channels, for which the secrecy capacity is zero if there is no channel feedback. Specifically, we focus on a seeded modular code design for the block-fading Gaussian wiretap channel with channel-output feedback, combining universal hash functions for security and learned feedback-based codes for reliability. The trade-off between communication reliability and information leakage is studied, illustrating that feedback enables agreeing on a secret key shared between legitimate parties, overcoming the security advantage of the eavesdropper. Our findings motivate code designs for sensing-assisted secure communications in the context of integrated sensing and communication (ISAC).
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