Powerline communications usually needs dedicated Ethernet (or what have you) <-> power line converter... I think they meant something more like powerhammer [1]

Powerline communications usually needs dedicated Ethernet (or what have you) <-> power line converter... I think they meant something more like powerhammer [1] which works by controlling processor workload, causing the power draw of the system to throttle up and down in such a way that it becomes a useful exfiltration channel (assuming your adversary can tap into a distribution board and measure power usage). [1] https://arxiv.org/pdf/1804.04014.pdf https://arxiv.org/pdf/1804.04014.pdf - by the same guy as the OP paper