[dwaterson] Secret whispers in the air – badBIOS

Air gapping is a technique of physically isolating a secure computer or network from an insecure network such as the internet. It is used in the highest security environments, such as where the military completely separate classified and unclassified data on independent systems. It has been thought that data cannot flow between unconnected systems separated by an air gap. Bruce Schneier developed 10 rules for setting up and maintaining an air gapped computer.