Information theoretic perspective of physical layer security
Talha Yılmaz, Hüseyin Arslan · 2022
Different perspectives have been formed on the security concept in communication technologies. As a result, academic researchers and experts in the field have developed many different approaches to data security. The dominant approach for data security has been cryptography for many years. However, recently physical layer security (PLS) research gathered enormous attention from the researchers. Even though mentioned approaches look quite different, they share the same fundamentals and philosophy. In this regard, this chapter first introduces readers to the history of security concepts in communication systems. Next, the information theory-based philosophy of secrecy is established. Finally, performance metrics that can be used to evaluate a security system are given to the readers. This chapter aims to explain the overall idea of PLS systems and form a handbook for researchers, engineers, and experts to consult in their research.