Security and Privacy in Wireless Communication

The advent of 5th generation and beyond wireless communication networks has introduced the challenges of ubiquitous connectivity, including high spectrum efficiency, and low latency. To address these concerns, sophisticated multiple access techniques like Non-Orthogonal Multiple Access (NOMA) have been developed. NOMA has been recognized as a promising solution, providing massive connectivity, high energy efficiency, and better user fairness. However, information in NOMA systems is susceptible to interception by illegitimate destinations because of the broadcast nature of wireless channels. This security issue becomes even worse due to untrusted user scenarios. This chapter investigates the security concerns of cooperative NOMA systems from external and internal eavesdropping and state-of-the-art research using decode-and-forward and amplify-and-forward relaying protocols.