VINSON is a family of voice encryption devices used by U.S. and allied military and law enforcement, based on the SAVILLE encryption algorithm and 16 kbit/s CVSD

Continuously variable slope delta modulation

Continuously variable slope delta modulation is a voice coding method. It is a delta modulation with variable step size Continuously variable slope delta modulation (CVSD or CVSDM) is a voice coding method. It is a delta modulation with variable step size Continuously variable slope delta...

 audio compression. It replaces the Vietnam War

Vietnam War

The Vietnam War was a Cold War-era military conflict that occurred in Vietnam, Laos, and Cambodia from 1 November 1955 to the fall of Saigon on 30 April 1975. This war followed the First Indochina War and was fought between North Vietnam, supported by its communist allies, and the government of...

-era NESTOR (KY-8/KY-28|28/KY-38|38) family.

These devices provide tactical secure voice

Secure voice

Secure voice is a term in cryptography for the encryption of voice communication over a range of communication types such as radio, telephone or IP.-History:...

 on UHF

Ultra high frequency

Ultra-High Frequency designates the ITU Radio frequency range of electromagnetic waves between 300 MHz and 3 GHz , also known as the decimetre band or decimetre wave as the wavelengths range from one to ten decimetres...

 and VHF

Very high frequency

Very high frequency is the radio frequency range from 30 MHz to 300 MHz. Frequencies immediately below VHF are denoted High frequency , and the next higher frequencies are known as Ultra high frequency...

 line of sight

Line-of-sight propagation

Line-of-sight propagation refers to electro-magnetic radiation or acoustic wave propagation. Electromagnetic transmission includes light emissions traveling in a straight line...

 (LOS), UHF SATCOM communication

Communication

Communication is the activity of conveying meaningful information. Communication requires a sender, a message, and an intended recipient, although the receiver need not be present or aware of the sender's intent to communicate at the time of communication; thus communication can occur across vast...

 and tactical phone systems. These terminals are unclassified Controlled Cryptographic Item

Controlled Cryptographic Item

A Controlled Cryptographic Item is a U.S. National Security Agency term for secure telecommunications or information handling equipment, associated cryptographic component or other hardware item which performs a critical COMSEC function.  Items so designated may be unclassified but are subject to...

s (CCI) when unkeyed and classified to the keymat

Keymat

Keymat is a generic term for any material used in the process of loading keys into a cryptographic device....

 of the key when going secure.

VINSON devices include:

• KY-57
  KY-57
  The Speech Security Equipment , TSEC/KY-57, is a portable, tactical cryptographic device in the VINSON family, designed to provide voice encryption for a range of military communication devices such as radio or telephone....
  
  
• KY-58
  KY-58
  The VINSON KY-58 is a secure voice module primarily used to encrypt radio communication to and from military aircraft and other tactical vehicles. It is employed by U.S. Military Joint Services, NATO and some law enforcement agencies. It is designed to operate over bandwidth-restricted circuits...
  
  
• KY-68
  KY-68
  The TSEC/KY-68 DSVT, or Digital Subscriber Voice Terminal, is a US military ruggedized, full- or half-duplex telephone terminal with a built-in encryption/decryption module for secure traffic. Converting voice to digital form, it can communicate voice or data at 16 or 32 kbit/s...
  
  
• KY-99a (MINTERM)
• KY-100 (AIRTERM)
• KYV-2
• FASCINATOR
  FASCINATOR
  FASCINATOR is a series of Type 1 encryption modules designed in the late-1980s to be installed in Motorola digital-capable voice radios. These radios were originally built to accept a DES-based encryption module that was not approved by NSA for classified communications...
  
  

VINSON is embedded into many modern military radios, such as SINCGARS

SINCGARS

SINCGARS is a Combat Net Radio currently used by U.S. and allied military forces. The radios, which handle voice and data communications, are designed to be reliable, secure and easily maintained...

. Many multi-algorithm COMSEC modules are also backwards-compatible with VINSON.