Flutterby™! : Air Gapping is not enough

ODINI : Escaping Sensitive Data from Faraday-Caged, Air-Gapped Computers via Magnetic Fields Mordechai Guri, Boris Zadov, Andrey Daidakulov, Yuval Elovici — Ben-Gurion University of the Negev Cyber Security Research Center:

In this paper, we present a new type of covert channel that can be used to exfiltrate information from air-gapped computers through Faraday cages. Our method uses low frequency magnetic fields generated by a computers CPU. These fields penetrate metal shields, and hence can be used to bypass the protective Faraday cages.