No. Powerline ethernet was pretty obviously going to have security issues along these lines from the go considering the lack of clear boundaries inherent in sen

No. Powerline ethernet was pretty obviously going to have security issues along these lines from the go considering the lack of clear boundaries inherent in sending data over wires connecting to a public grid and included cryptography from the go. I know Homeplug devices have been on AES since the mid-2000s using either passwords or push button config and G.hn had something similar going on.