As a promising technology, physical layer security (PLS) enhances security by leveraging the physical characteristics of communication channels. However, the conventional PLS approach leads to a considerable disparity in the effort legitimate users need to secure data compared to eavesdroppers. To address this issue, we propose a physical layer deception (PLD) framework, which applies random deceptive ciphering and orthogonal frequency-division multiplexing (OFDM) to defend against eavesdropping proactively. While ensuring the same level of confidentiality as traditional PLS methods, the PLD approach additionally introduces a deception mechanism, even when the eavesdropper possesses the same knowledge about the transmitter end as the legitimate receiver. Through thorough theoretical analyses and numerical simulations, we prove the superiority of our method over the conventional PLS approach.

翻译：作为一种前景广阔的技术，物理层安全通过利用通信信道的物理特性来增强安全性。然而，传统的物理层安全方法导致合法用户保护数据所需付出的努力与窃听者相比存在显著差距。为解决这一问题，我们提出了一种物理层欺骗框架，该框架应用随机欺骗加密和正交频分复用技术来主动防御窃听。在确保与传统物理层安全方法相同保密等级的同时，即使窃听者拥有与合法接收端相同的发射端知识，物理层欺骗方法仍能额外引入欺骗机制。通过深入的理论分析和数值仿真，我们证明了该方法相对于传统物理层安全方法的优越性。