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USA
NSA
Voice
Data
SAVILLE
  
← VINSON
  
ANDVT
Advanced Narrowband Digital Voice Terminal

ANDVT, or Advanced Narrowband Digital Voice Terminal, is a family of devices for secure voice communication via narrowband channels, developed in the late 1970s by the US National Security Agency (NSA) for use by the US Department of Defense. ANDVT uses LPC-10 voice compression (vocoder) and the secret SAVILLE encryption algorithm jointly developed by GCHQ and NSA. Some ANDVT devices were backward compatible with the earlier VINSON wideband voice encryptors.

ANDVT devices
AN/USC-43 (TACTERM) Tactical secure voice and data Terminal
USC-43 TACTERM
KYV-5 (TACTERM) Tactical secure voice and data Terminal
KY-99, KY-99A and KY-99M (MINTERM) Narrow-band Voice and Data Terminal
KY-100 and KY-100M (AIRTERM) Narrow-band Voice and Data Terminal
Related equipment
KY-57 (VINSON) Wide-band Voice and Data Encryption Unit
SINCGARS ICOM compatible radios
HYX-57 wireline adapter
Digital Subscriber Voice Terminal
AN/KOI-18 Key Tape Reader
AN/KYK-13 Key Transfer Device
AN/CYZ-10 Data Transfer Device
Advanced INFOSEC Machine II
Embeddable COMSEC module
YouTube
Sound Sample
This is a sample of an ANDVT com-check, recorded on 10 August 2011 at 03:31 UTC on 13.224 MHz in USB, in the Mojave Dessert in California (USA). The sample starts with clear voice and then switches to secure mode.

Source: FirstToken on YouTube
Posted 1 September 2013

  

E6-to-E6 US military
radio communications
This video is from an ongoing project by YouTube user NEET INTEL, who has documented secure communications between E6 units on several occasions. On this occasion, the KY-100 was used on 9 MHz in AM.

Source: NEET INTEL on YouTube
Posted 1 September 2013

  

Encrypted Digital Voice
on a Raspberry Pi
An interesting open-source project for an ANDVT-like solution that you can build yourself, can be found on Git­Hub. User aarmono demon­strates how he uses two Raspberry Pi 3 units to send an encrypted message over narrowband shortwave radio.

 More on GitGub

  


References
  1. Naval Research Laboratory,
    Fulfilling the Roosevelts' Vision for American Naval Power (1923-2003)

    30 June 2006 p. 39 (approved for public release)

  2. Naval Research Laboratory,
    Fulfilling the Roosevelts' Vision for American Naval Power (1923-2003)

    30 June 2006 p. 65 (approved for public release)

  3. NRL and the Advanced Narrowband Secure Voice Terminal
    Timeline of the ANDVT development. Undated.
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Crypto Museum. Created: Thursday 12 September 2019. Last changed: Tuesday, 30 April 2024 - 16:36 CET.
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