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History
Tempest (codename)
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TEMPEST is a U.S. National Security Agency specification and a NATO certification referring to spying on information systems through leaking emanations, including unintentional radio or electrical signals, sounds, and vibrations. TEMPEST covers both methods to spy upon others and how to shield equipment against such spying. The protection efforts are also known as emission security (EMSEC), which is a subset of communications security (COMSEC).
Bell 131B2 mixer, used to XOR teleprinter signals with one time tapes, was the first device from which classified plain text was extracted using radia
Bell 131B2 mixer, used to XOR teleprinter signals with one time tapes, was the first device from which classified plain text was extracted using radiated signals.
Rotor machines, like this SIGCUM, were an early source of compromising TEMPEST effects
Rotor machines, like this SIGCUM, were an early source of compromising TEMPEST effects
Relay logic, such as in this Flexowriter was another major early source of TEMPEST radiation.
Relay logic, such as in this Flexowriter was another major early source of TEMPEST radiation.
Communications security
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Communications security is the discipline of preventing unauthorized interceptors from accessing telecommunications in an intelligible form, while still delivering content to the intended recipients.
PRC-77 VHF radio with digital voice encryption device
PRC-77 VHF radio with digital voice encryption device