Two common methods of physical cybersecurity, air gapping and Faraday cages, have been found breachable in two papers released by researchers from Ben-Gurion University.
Faraday cages are grounded cages made of electrically conductive material that can completely block electromagnetic fields and signals. Air-gapped computers are those completely isolated from outside networks and signals. Air-gap setups commonly include Faraday cages.
Anyone who has interacted with a Faraday cage can attest to their effectiveness—put a smartphone in a Faraday cage and you can watch the signal drop instantly. What researchers found, however, is that commonly overlooked low-level magnetic fields can still penetrate air gaps and Faraday cages, allowing attackers to intercept and steal data.