Keyboard Lights As An Airgap Attack Vector

A researcher built a covert unidirectional data channel across an air gap using keyboard LEDs and photoresistors. By stripping two Dell SK-8115 keyboards to their controller PCBs, soldering photoresistors to keyboard matrix pins, and aligning them with Num Lock and Caps Lock LEDs, one PC can 'type' on an air-gapped machine by flashing the LEDs in patterns. This technique can be used to inject small programs onto isolated machines as a foothold for further exploitation.

Source: https://hackaday.com/2026/07/29/keyboard-lights-as-an-airgap-attack-vector. 8sync News only summarizes and links out; content copyright belongs to the authors and original sources.