Physical Layer Security
摘要
In recent years, the domain of Physical layer securityintroductionphysical layer security (PLS) has gained significant traction as an innovative method to augment information confidentiality, complementing traditional cryptographic techniques applied at higher network layers. This chapter presents our work published in [1], which meticulously examined the security performance of a two-way relay network (TWRN) configuration where direct communication between the two source nodes is infeasible, necessitating reliance on intermediate relay nodes. The focus is directed toward scenarios involving an eavesdropper positioned in proximity to one of the source nodes. The analysis integrates both communication reliability and information security perspectives. To improve the quality of communication, the intermediate relays harvest energy from the sources’ radio frequency (RF) signals using a hybrid time-switching and power-splitting (TPSR) protocol. Additionally, a relay selection mechanism is employed to identify the optimal relay for facilitating information exchange between the two sources. To disable the wiretap activity, the presence of friendly jammers near the eavesdropper is introduced to enhance the system secrecy capacity. Our comprehensive evaluations encompass closed-form expressions for critical metrics such as outage probability (OP) at source nodes, intercept probability (IP) at eavesdroppers, secrecy outage probability (SOP), and average secrecy capacity (ASC). To verify these analytical findings and demonstrate our scheme’s efficacy, Monte Carlo simulations are employed rigorously. The numerical results reveal that with judicious parameter selection—taking into account constraints like energy harvesting efficiency and jammer power–both OP and IP can be effectively minimized. This ensures reliable and secure communication within our proposed system framework while adhering to stringent standards anticipated in advanced wireless networks research.