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KY - 99 A ( Minterm )
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KY - 99 A ( Minterm )
Entwicklungsbeginn : ca. 1970  NSA / USA
Schlüsselsystem : keine Angaben
Arten der Chiffrierverkehre : keine Angaben
kryptologische Festigkeit : keine Angaben
Betriebsart : Mono- Kanal - Halb - Duplex
Übertragungsart der Information : 75 Bd ... 9.600 Bit/s
Information :
 
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KY-99A (MINTERM)
Voice and data encryption unit

The TSEC/KY-99A is an Advanced Narrowband Digital Voice Terminal (ANDVT) that was used for many years by the US Department of Defence (DoD) for secure voice transmission over narrow band radio channels. It is interoperable with the other members of the ANDVT-family and is backwards compatible with the KY-57 that if effectively replaces.

The image on the right shows a typical KY-99 unit that was built by ITT Industries. The unit measures 140 x 77 x 200 mm and weights approx. 2 kg. It is a stand-alone unit that needs its own battery (connected at the back).

At the front are three sockets. At the top are two standard 6-pin U-229 connectors for AUDIO and DATA respectively. The DATA connector is also used to connect the key FILL device. The 13-pin connector high-density for the radio is at the bottom left. The volume control/power switch is at the center.
KY-99 MINTERM voice crypto unit

The MODE selector is at the bottom right. There are 5 modes of operation: Plantext, Ciphertext, Re-key, Off-line and ZEROIZE. The rest of the operation is via the three push-buttons and the green 8-position alpha-numerical display.

The ANDVT-family of voice encryption devices was launched in the late-1970s with the introduction of the AN/USC-43 Tactical Terminal (TACTERM). It was based on the NRLs first succesful implementation of LPC-10 in 1973 [1] .

The KY-99 (MINTERM) is in fact a miniaturized version of the TACTERM. Its designed is based on a modular architecure and its size is much reduced. The KY-99 features full key distribution plus remote key capability (OTAR) and was certified for secure traffic up to TOP SECRET (NSA Type 1). The KY-99 is also known by its COMSEC designator TSEC/KY-99.

It is not exactly known when the KY-99 was introduced, but it is certain that it was available in 1992 [4] . By 2006, over 40,000 ANDVT units were in operation at the US Navy, Air Force, Army, Allied Forces and government agencies. This includes 9363 KY-99 units that represented a value of US$ 6207 each [2] .