The use of white noise generation is a countermeasure to protect against the threat of eavesdropping on electromagnetic emanations from computing equipment. This method involves broadcasting random electromagnetic signals, which are referred to as‘white noise’, to mask the genuine signals emitted by electronic devices. This makes it significantly more difficult for unauthorized parties to intercept and decipher the information being processed by the genuine equipment.

A Faraday cage (A) is designed to block external electromagnetic fields but does not specifically broadcast false signals to mask emanations. Unshielded cabling (B) would actually increase the risk of emanation interception rather than protect against it. Copper infused windows © can shield against electromagnetic signals but, like the Faraday cage, do not broadcast false emanations.

References: The BCS Foundation Certificate in Information Security Management Principles outlines the importance of protecting against the leakage of information through electromagnetic emanations and suggests countermeasures like white noise generation as part of physical security controls1.