The following topics are dealt with: secrecy metrics; physical layer security; fading channels; secure data networks; confidential energy-efficient communications; antenna selection strategies; wiretap channels; massive MIMO systems; anti-jamming; multiuser relay networks; trusted wireless communications; spatial multiplexing; wirelessly powered communication systems; D2D-enabled cellular networks; cognitive radio networks; mmwave cellular networks; directional-modulation-enabled physical-layer wireless security; 5G systems; non-orthogonal multiple access; MIMOME-OFDM systems; wireless channels and secrecy coding.