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An Anonymous Coward writes:

by Oona Räisänen February 27, 2023

Using HDMI EMI for fast wireless data transfer

This story, too, begins with noise. I was browsing the radio waves with a software radio, looking for mysteries to accompany my ginger tea. I had started to notice a wide-band spiky signal on a number of frequencies that only seemed to appear indoors. Some sort of interference from electronic devices, probably. Spoiler alert, it eventually led me to broadcast a webcam picture over the radio waves... but how?

[...]

This was a fun project but this kind of a vulnerability could, in the tinfoiliest of situations, be used for exfiltrating information out of a supposedly airgapped computer.

Read entire article with pics and video:

https://www.windytan.com/2023/02/using-hdmi-radio-interference-for-high.html [windytan.com]

Original Submission