Post date: Jul 01, 2013 12:00:00 PM

By definition air-gapped devices are on a separate network from the rest of the internet.

How could you communicate from an air gapped machine to the rest of the world?

(Based on a conversation I had with an author in 2013)

Power Modulation

Modulating the current consumption of a computer would make a device capable of measuring the load on a buildings power supply detect the presence of a program modulating the load on a computer (CPU load, Disk activity, GPU load, etc). You could possibly defend against this by isolating the machine from the power supply of the building by inserting a UPS or just have it run from a generator. Bandwidth - extremely low, unidirectional.