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Terahertz (THz) communications (THzCom) has experienced a meteoric rise ofinterest, due to its benefits for ultra-high data rate transmission in thesixth generation (6G) and beyond era. Despite so, the research on exploring thepotential of THzCom for other performance targets anticipated by 6G, includingmassive connectivity and security, is still in its infancy. In this article, westart with briefly describing the unique peculiarities of THz channels, andthen discuss theoretical frameworks to facilitate the analysis and design ofTHz transmission for achieving massive connectivity and security. Then wediscuss promising spectrum management strategies, including the exploration ofmultiple THz transmission windows and frequency reuse with multiplexing andsignal processing, to substantially increase the number of supported users andidentify to-be-tackled challenges. We further present important researchdirections based on the principles of physical layer security, such as newspectrum allocation policies and beamforming algorithms, to fight againsteavesdropping in THzCom systems, ushering in secure THzCom systems.

Terahertz Communications for Massive Connectivity and Security in 6G and Beyond Era