Joint communication and sensing is expected to be one of the features introduced by the sixth-generation (6G) wireless systems. This will enable a huge variety of new applications, hence, it is important to find suitable approaches to secure the exchanged information. Conventional security mechanisms may not be able to meet the stringent delay, power, and complexity requirements which opens the challenge of finding new lightweight security solutions. A promising approach coming from the physical layer is the secret key generation (SKG) from channel fading. While SKG has been investigated for several decades, practical implementations of its full protocol are still scarce. The aim of this chapter is to evaluate the SKG rates in real-life setups under a set of different scenarios. We consider a typical radar waveform and present a full implementation of the SKG protocol. Each step is evaluated to demonstrate that generating keys from the physical layer can be a viable solution for future networks. However, we show that there is not a single solution that can be generalized for all cases, instead, parameters should be chosen according to the context.

翻译：联合通信与感知预计将成为第六代（6G）无线系统引入的特性之一。这将催生大量新应用，因此找到保护交换信息安全的合适方法至关重要。传统安全机制可能无法满足严格的时延、功耗和复杂度要求，这带来了寻找新型轻量级安全解决方案的挑战。一种来自物理层的有前景的方法是信道衰落秘密密钥生成（SKG）。尽管SKG已被研究数十年，但其完整协议的实际实现仍然稀少。本章旨在评估真实场景下多种不同情境中的SKG速率。我们采用典型的雷达波形，并给出SKG协议的完整实现。通过评估每个步骤，证明从物理层生成密钥可成为未来网络的可行解决方案。然而，研究表明并无适用于所有情况的通用方案，而应根据具体场景选择参数。