These attacks work against defenders that can’t be bothered to implement WW2 era defences. These kinds of “attacks” have been well understood for a good 70 year

These attacks work against defenders that can’t be bothered to implement WW2 era defences. These kinds of “attacks” have been well understood for a good 70 years now. It’s simply restating the obvious. Nothing has changed, unshielded electronics continue to let out measurable EM emissions. The people who worry about this sort of thing have been shielding their electronics since well before computers as we know them existed. > Probably took non-zero effort to develop? In the sense that doing anything takes non-zero effort by definition.