# The picture is the transmitter

The screen shows nothing suspicious. Inside the video cable, tiny pixel changes can produce a controlled electromagnetic emission. TrojPix shows how a physically isolated network can still have an exit through its monitor.

## Simulation

The page presents a visual reconstruction of the route `pixel → video sample → EM emission → data`. The picture stays almost unchanged, while the oscilloscope line represents the signal in the model. The simulation emits no radio signal, accepts no files, and does not implement the TrojPix decoder.

## What the authors measured

The paper reported a peak throughput of 8.1 Mbps and a maximum range of 208 metres under the tested conditions. The evaluation covered nine commercial monitor manufacturers and fifteen commercial digital video cables, in two test modes: *fake screen-off* and *foreground embedding*.

These are maximum laboratory results, not promises for every monitor, cable, or room.

## Source

[USENIX Security ’26: TrojPix](https://www.usenix.org/conference/usenixsecurity26/presentation/zhang-guoming)