Air-gapped secured systems

Into_Oblivion1 · May 9, 2025

Tester said:
One thing to understand that a signal does not have to be something programmed.

A very simplistic example, heat is is signal. With the right equipment you can see a device getting hotter or cooler. Program a program, that sends S.O.S with interval of 1minute, 1minute hot(full load cpu), 1min cool(no cpu activity), then 1min full load again etc. Then someone who is looking at the heat signature and see it getting hotter, cooler, hotter in a patern, it can receive a message like that.
The device that is getting hotter and cooler, was not designed to broadcast a signal like that, however it could.
Same goes with some of the noise an device gives off, controlling the fan speed. Or creating a workload that changes cpu frequenes that can be lisend to. Or the EM redation a device gives off.

But what you desribe are big things, like an ON / OFF switch or.
The processes inside a computer with bits all over the place in CPU, GPU, memory, flash drive etc. - that is millions of 1 and 0 / + and - / ON and OFF per second.
And that is was makes it hard for me to understand, that it can be possible?

Tester said:
One thing to understand that a signal does not have to be something programmed.

Same goes with some of the noise an device gives off, controlling the fan speed. Or creating a workload that changes cpu frequenes that can be lisend to. Or the EM redation a device gives off.

The not-programmed signals, that still can be intercepted.
Can they be received through walls etc.?

And the receiver, what is that?
Some super advanced equipment, that like only NSA has?

Air-gapped secured systems

Into_Oblivion1

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