This October, researchers Hyeongjun Choi, Ji Hyuk Jung and Ji Won Yoon from Korea University and 78ResearchLab in Seoul have published a paper describing "SPECTER", a covert channel that leaks data from air-gapped computers by repeatedly switching the power state of attached USB devices. This first requires installing malware with root or administrator privileges, which then controls power via the operating system's suspend or disable/enable controls. No modification to the peripheral's hardware or firmware is needed. Three receiving methods were demonstrated, with one being RF based. The firs
https://www.rtl-sdr.com/specter-leaking-data-from-air-gapped-computers-by-toggling-usb-power-states/
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