[kartan]

This reminds me of a similar article many years ago about reading network packet content from the light of the led in network cards.

It is another example of how things are safer in practice than in theory. Entropy helps to keep things safe by introducing noise. All these measures are easier in a lab than in the wild.

[anfractuosity]

I guess you might mean this paper which is very cool - http://applied-math.org/optical_tempest.pdf