Information, Computer and Network Security Terms Glossary and
Tempest Shielding refers to the shielding of devices from Electromagnetic Interference (EMI) and to ensure communications security (TEMPEST). The most sophisticated devices use advanced micro-components that have been designed from scratch to minimize Tempest emanations. Generally, shielding involves encompassing the device in a Faraday cage that does not permit stray emanations, along with special modifications to the power source. This usually involves a heavy metal case around an object. Tempest shielding also involves such issues as the design of a room and placement of equipment within it, to ensure that no information can escape.