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KY - 57 ( VInson )
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KY - 57 ( Vinson )
Entwicklungsbeginn : Mitte 1952  NSA / USA
Schlüsselsystem : Rotor - System
Arten der Chiffrierverkehre : keine Angaben
kryptologische Festigkeit : Adonis  high level;  Pollux low level
Betriebsart : keine Angaben mechanische - elektrische Konstruktion
Übertragungsart der Information : keine Angaben
Information :
KY-57 (VINSON)
Voice encryption unit

The KY-57 was a wide-band voice encryption unit that was developed in the USA during the 1970s as a replacement of the NESTOR cryptographic products, such as the KY-38. It was suitable for use with a wide range of military radios and telehone lines. As part of the VINSON family of devices, it was the main crypto 'workhorse' of the US Army during the 1980s. Even today, many radios and voice encryption devices are still backwards compatible with the KY-57, that is also known as the TSEC/KY-57. The airborne version of the KY-57 is called the KY-58.

The KY-57 uses the NSA-developed Type-1 SAVILLE cryptographic algorithm. When used in combination with a radio transceiver, such as the SINCGARS non-ICOM RT-1439/VRC, the KY-57 allows signal fades or losses for up to 12 seconds without losing synchronization.

The KY-57 was eventually superceeded by the KY-99 that offered newer - more advanced - cryptographic algorithms, but still was backwards compatible with the KY-57. Later SINCGARS ICOM radios, such as the RT-1523, had built-in KY-57 compatibility.
KY-57 voice encryption unit

Both voice and data can be encrypted with the KY-57. Voice data is digitized using Continuous Variable Slope Delta modulation (CVSD), similar to other voice crypto systems of the same era, such as the Philips Spendex-10 and the Telsy TS-500. Data from the CVSD modulator is mixed with data from a key stream generator that is seeded by a Traffic Encryption Key (TEK). The resulting digital data stream of 16 kbps requires a wide-band radio channel, making it unsuitable for use on HF radio frequencies. Rather than the standard 5 kHz (voice only) channel spacing, the KY-57 requires a 25 kHz channel, which is why it is a VHF/UHF-only product. The KY-57 was sometimes used in combination with HAVE QUICK frequency hopping.

The KY-57 was produced until 1993, when it was replaced by more advanced encryption units such as the KY-99 and radios with integrated COMSEC [1] .