I am a PhD student in ECE. I work on physical layer, and am recently venturing into physical-layer security. Bloch et al is one good resource I found regarding this. However, I tried looking for some video lectures or tutorials regarding this and could only find a few. I can list them here if there is any interest (Mainly by H.Vincent Poor, Joao Barros (one of the authors of the textbook aforementioned), Sennur Ulukus). Please let me know if you know of any other video lectures which could provide a good understanding.