KG - 84 Military digital line encryptor
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Information : |
Military digital line encryptor
The KG-84 is an electronic encryption device developed
by the National Security Agency (NSA) in the USA. It was
used for ensuring secure transmission of digital data
over a variety of networks, such as landlines,
satellites, microwave links and Telex lines. The KG-84
was built by Pulse Engineering, Inc. and Bendix.
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Two versions of the KG-84 are known. The KG-84A that was
mainly used for point-to-point encryption via telephone
lines, microwave links and satellites, and the KG-84C
that was a Dedicated Loop Encryption Device (DLED).
Both are able to operate in simplex, half-duplex and
full-duplex synchronous and asynchronous modes. This NSA
Level 1 crypto device is suitable for secret messages
upto the level of TOP SECRET, depending on the key-set
that is loaded. It is fully complient with NSA TEMPEST
standards. |
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Compared to the KG-84A, the KG-84C had some interesting
extras. It has a variable update counter, improved HF
performance, out-of-sync detection (when in synchronous
mode), asynchronous ciphertext, plaintext bypass, and
the European Telex protocol. When used with a suitable
digital telephone unit, the KG-84 could also be used for
secure voice transmissions.
Data could be handled by the KG-84 in asynchronous mode
at rates between 50 and 9600 baud. In synchronous mode,
it could even go up to 32,000 baud (or even 64,000 baud
when used in combination with an external clock). A
later version of the KG-84, the commercial
KIV-7, was suitable for even higher data rates.
The KG-84 was a Controlled Cryptographic Item (CCI) but
was UNCLASSIFIED when unkeyed. Although most of the
military KG-84 units have now been replaced by
commercial-off-the-shelf equipment (COTS), such as the
KIV-7, or were superceeded by modern IP-Crypto
equipment, they are not commonly found in museums. The
image on this page was taken from a surplus KG-84 front
panel. The rest of the machine is, unfortunately,
missing.
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