SAVILLE

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SAVILLE is an NSA Type 1 encryption algorithm. It is used broadly, often for voice encryption, and implemented in a large number of encryption devices.

Little is known publicly about the algorithm itself. Some documentation related to the KYK-13 fill device and statements made by military officials suggest that SAVILLE has a 128-bit key. On the AIM microchip, it runs at 4% of the clock rate (compare DES at 76% and BATON at 129%). The Cypris chip mentions 2 modes; specifications for Windster and Indictor specify that they provide Saville I.

Some devices and protocols that implement SAVILLE:

  • The VINSON family (voice encryption)
  • APCO Project 25 (single-channel land mobile radios) (Saville has algorithm ID 04)
  • Versatile encryption chips: AIM, Cypris, Sierra I/II, Windster, Indictor, Presidio, Railman
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