This is a very interesting idea! I love stuff like this.

It reminds of something I read years ago. I read that the NSA (IIRC...it was some spy agency) had a device that could read the contents of a hard drive without physically being connected to the machine. The article said the device had to be CLOSE to the computer. But it could be hidden under a desk or something.

I can't remember where I read this but I thought it was fascinating.

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Cat; the other white meat.

There are all sorts of covert channels, it's really interesting! You might have seen the video of the man shouting at his storage array in a noisy datacentre, and seeing the access latency go up. And rather recently, some research showing that random address allocations can be determined by observing performance variations- because, I think, all processes share the same machinery. And another like that. Also, password inference using a phone's motion detectors, or a laptop's microphone.