Ben Gurion university's Mordechai Guri is a master exfiltrator, a computer scientist who's devised a bewildering array of innovative techniques for getting data off of "airgapped" computers that have been fully disconnected from any kind of network.
Computers that are isolated from the internet and local networks are said to be "airgapped," and it's considered a best practice for securing extremely sensitive systems.
In a new paper, researchers from Ben-Gurion University demonstrate a fiendishly clever procedure for getting data off of airgapped computers that have had their speakers removed to prevent acoustic data-transmission: instead of playing sound through the target computer's speakers, they attack its fans, varying their speeds to produce subtle sounds that humans can barely notice, but which nearby devices can pick up through their microphones.
