Physical layer security (PLS) is a promising technology to secure wireless communications by exploiting the physical properties of the wireless channel. However, the passive nature of PLS creates a significant imbalance between the effort required by eavesdroppers and legitimate users to secure data. To address this imbalance, in this article, we propose a novel framework of physical layer deception (PLD), which combines PLS with deception technologies to actively counteract wiretapping attempts. Combining a two-stage encoder with randomized ciphering and non-orthogonal multiplexing, the PLD approach enables the wireless communication system to proactively counter eavesdroppers with deceptive messages. Relying solely on the superiority of the legitimate channel over the eavesdropping channel, the PLD framework can effectively protect the confidentiality of the transmitted messages, even against eavesdroppers who possess knowledge equivalent to that of the legitimate receiver. We prove the validity of the PLD framework with in-depth analyses and demonstrate its superiority over conventional PLS approaches with comprehensive numerical benchmarks.

翻译：物理层安全（PLS）是一种利用无线信道物理特性保障无线通信安全的前沿技术。然而，其被动防护特性导致窃听方与合法用户在保障数据安全所需付出的努力存在显著失衡。为应对这一失衡问题，本文提出一种新型物理层欺骗（PLD）框架，将物理层安全技术与主动欺骗技术相结合以对抗窃听行为。该PLD方案通过两级编码器结合随机加密与非正交复用技术，使无线通信系统能够主动发送欺骗性信息以对抗窃听者。仅需依赖合法信道相对于窃听信道的优势，PLD框架即可有效保障传输信息的机密性，即使面对具备与合法接收方同等知识的窃听者亦能奏效。我们通过深入的理论分析证明了PLD框架的有效性，并基于全面的数值基准测试展示了其相较于传统PLS方法的优越性。