SEL-111K "Chiffon" - an active information protection from TEMPEST
SEL-111K "Chiffon" is an active information protection from TEMPEST (Transient Electromagnetic Pulse Emanation Standard) leakage system is designed to protect information processed by technical means and systems by generating an electromagnetic field noise interference signal over a wide frequency range in space and electrical noise signals on the conductors, including on the ground circuit and the power supply conductive lines and engineering communications beyond the controlled area.