SAVILLE is a classified

NSA The National Security Agency (NSA) is a national-level intelligence agency of the United States Department of Defense, under the authority of the Director of National Intelligence (DNI). The NSA is responsible for global monitoring, collectio ...

Type 1 encryption algorithm, developed in the late 1960s, jointly by the Government Communications Headquarters (GCHQ) in the UK and the

National Security Agency (NSA) The National Security Agency (NSA) is a national-level intelligence agency of the United States Department of Defense, under the authority of the Director of National Intelligence (DNI). The NSA is responsible for global monitoring, collectio ...

in the US. It is used broadly, often for voice encryption, and implemented in many encryption devices. Little is known publicly about the algorithm itself due to its classified nature and inclusion in the NSA's Suite A. Some documentation related to the

KYK-13 The KYK-13 Electronic Transfer Device is a common fill device designed by the United States National Security Agency for the transfer and loading of cryptographic keys with their corresponding check word. The KYK-13 is battery powered and uses the ...

fill device and statements made by military officials confirm that SAVILLE has a 128-bit key, which consists of 120 key bits and an 8-bit checksum. Furthermore, it is known that SAVILLE has two modes of operation: Autonomous Mode (also known as Key-Auto-KEY or KAK) and Autoclave Mode (also known as Cipher-Text Auto Key or CTAK). On the AIM

microchip An integrated circuit or monolithic integrated circuit (also referred to as an IC, a chip, or a microchip) is a set of electronic circuits on one small flat piece (or "chip") of semiconductor material, usually silicon. Large numbers of tiny M ...

, it runs at 4% of the clock rate (compare

DES Des is a masculine given name, mostly a short form (hypocorism) of Desmond. People named Des include: People * Des Buckingham, English football manager * Des Corcoran, (1928–2004), Australian politician * Des Dillon (disambiguation), sever ...

at 76% and

BATON Baton may refer to: Stick-like objects *Baton, a type of club *Baton (law enforcement) *Baston (weapon), a type of baton used in Arnis and Filipino Martial Arts *Baton charge, a coordinated tactic for dispersing crowds of people *Baton (conductin ...

at 129%). The Cypris chip mentions two modes; specifications for Windster and Indictor specify that they provide Saville I. Some devices and protocols that implement SAVILLE: * Secure Telephone Equipment (STU) * The

VINSON VINSON is a family of voice encryption devices used by U.S. and allied military and law enforcement, based on the National Security Agency, NSA's classified NSA Suite A Cryptography, Suite A Saville (cipher), SAVILLE encryption algorithm and 16 ...

family (voice encryption) * UK Lamberton (BID/250) * APCO Project 25 (single-channel land mobile radios) (Saville has algorithm ID 04) * Versatile encryption chips: AIM,

Cypris Aphrodite ( ; grc-gre, Ἀφροδίτη, Aphrodítē; , , ) is an ancient Greek religion, ancient Greek goddess associated with love, lust, beauty, pleasure, passion (emotion), passion, and procreation. She was syncretized with the Roman god ...

, Sierra I/II, Windster, Indictor, Presidio, Railman
Spendex 40

(also known as DBT)

References

External links

Block ciphers Type 1 encryption algorithms {{crypto-stub