The paper "Safeguarding Next Generation Multiple Access Using Physical Layer Security Techniques: A Tutorial" by Lu Lv et al. addresses the challenges and opportunities in securing next-generation multiple access (NGMA) networks, particularly non-orthogonal multiple access (NOMA). NOMA is highlighted as a promising solution for ultra-high spectral efficiency, ultra-low latency, and massive connectivity in 6G networks. However, the open nature of the air interface and the broadcast characteristic of radio propagation pose significant security threats, such as eavesdropping, signal interference, and jamming. To address these challenges, the paper explores physical layer security (PLS) techniques, which exploit the inherent characteristics of wireless channels like fading, interference, and noise to achieve information-theoretic security, quantum-safe security, and low-detection covertness. The authors review the fundamentals of NOMA and PLS, including analytical models, system-level simulations, and real-world prototypes. They also discuss emerging information-theoretic security techniques, quantum-safe technologies, and low-detection covertness methods. The paper emphasizes the potential of multiuser interference in NOMA to enhance security and privacy, and how superimposed NOMA transmissions can be used as natural shields for covert communication. It further outlines research directions and future trends in securing NOMA systems, including the integration of emerging technologies like intelligent surfaces, cooperative relays, large antenna arrays, quantum computing, and ambient backscatter communication. Overall, the tutorial provides a comprehensive overview of state-of-the-art PLS techniques for NOMA in 6G networks, highlighting their benefits and addressing technical challenges and future research opportunities.The paper "Safeguarding Next Generation Multiple Access Using Physical Layer Security Techniques: A Tutorial" by Lu Lv et al. addresses the challenges and opportunities in securing next-generation multiple access (NGMA) networks, particularly non-orthogonal multiple access (NOMA). NOMA is highlighted as a promising solution for ultra-high spectral efficiency, ultra-low latency, and massive connectivity in 6G networks. However, the open nature of the air interface and the broadcast characteristic of radio propagation pose significant security threats, such as eavesdropping, signal interference, and jamming. To address these challenges, the paper explores physical layer security (PLS) techniques, which exploit the inherent characteristics of wireless channels like fading, interference, and noise to achieve information-theoretic security, quantum-safe security, and low-detection covertness. The authors review the fundamentals of NOMA and PLS, including analytical models, system-level simulations, and real-world prototypes. They also discuss emerging information-theoretic security techniques, quantum-safe technologies, and low-detection covertness methods. The paper emphasizes the potential of multiuser interference in NOMA to enhance security and privacy, and how superimposed NOMA transmissions can be used as natural shields for covert communication. It further outlines research directions and future trends in securing NOMA systems, including the integration of emerging technologies like intelligent surfaces, cooperative relays, large antenna arrays, quantum computing, and ambient backscatter communication. Overall, the tutorial provides a comprehensive overview of state-of-the-art PLS techniques for NOMA in 6G networks, highlighting their benefits and addressing technical challenges and future research opportunities.