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The vast majority of the National Security Agency's work on encryption is classified, but from time to time NSA participates in standards processes or otherwise publishes information about its cryptographic algorithms. The following is a brief and incomplete summary of public knowledge about NSA algorithms and protocols.

See also NSA encryption systems.

1 Type 1

Name	Type	Specification	Use	Equipment (incomplete list)
ACCORDIAN (or ACCORDION)		R21-TECH-13-00, "ACCORDIAN 3.0 Specification" (August 2000)		AIM (1999 and 2004 brochures), SafeXcel-3340
BATON	Block cipher		Various	PKCS #11, CDSA/CSSM , AIM (1999 and 2004 brochures), Cypris , APCO Project 25, MYK-85 , Fortezza Plus, SecNet-11 , Sierra , SafeXcel-3340
BAYLESS				Cypris
BYTEMAN				Cypris
CARDIGAN				Cypris
CARDHOLDER			Satellite uplink command encryption	Cypris , KI-17 , U-AYJ Flight Decrypt Chip (Cardholder), Flight Encrypt Chip (Cardholder), MYK-16 , CXS-810 , CXS-2000 , MCU-100 , MCU-600
CARIBOU			Satellite uplink command encryption	U-TXZ , MYK-15A
CRAYON				AIM (2004 brochure), Cypris (4 modes)
FASTHASH	Cryptographic hash function		MISSI Type 1 hash	PKCS #11, CDSA/CSSM
FIREFLY			EKMS public-key cooperative key generation	AIM (2004), SafeXcel-3340
HAVE QUICKHAVE QUICK is a military system to protect UHF radio traffic. Since the end of World War II U. and allied military aircraft have used AM radios in the 225-400 MHz UHF band for short range air-to-air and ground-to-air communications. Military planners made			Antijam, LPI/LPD airborne voice communication	Cypris
JACKNIFE				AIM (2004)
JOSEKI		R21-TECH-0062-92, "JOSEKI-1, A Bootstrap Procedures" (Oct. 1992) (also R21-TECH-13-97, R21-TECH-13-98)	Protection of secret algorithms in firmwareIn computing, firmware is software that is embedded in a hardware device, that allows reading and executing the software, but does not allow modification, e. writing or deleting data by an end user. Examples of firmware include: the BIOS found in personal	AIM
JUNIPER	Block cipher			PKCS #11, CDSA/CSSM
KEESEE				AIM (1999 and 2004 brochures), Cypris
Mark XII IFF			IFF secondary radar	AIM (2004 brochure)
MAYFLY	Asymmetric-key algorithm			PKCS #11, CDSA/CSSM
MEDLEY		R21-TECH-30-01, "MEDLEY Implementation Standard" (Nov. 2001)		AIM (2004) , SecNet 54 , SafeXcel-3340
PEGASUS			Satellite telemetry and mission data downlinks	KG-227 , KG-228 , KI-17 , U-BLW Pegasus Space Microcircuit Chip, U-BLX Pegasus Ground Microcircuit Chip, MYK-17 , CXS-810 , CXS-2000 , MCU-100 , MCU-600
PHALANX				AIM (1999 and 2004 brochures), Cypris (PHALANX I and PHALANX II)
SAVILLESAVILLE 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 publically about the algorithm itself. Some documentation related to the KYK-13 fill de			Low-bandwidth voice (and sometimes data) encryption	AIM (1999 and 2004 brochures), Cypris (2 modes), Windster (SAVILLE I), VINSONVINSON is a family of voice encryption devices used by U. and allied military and law enforcement, based on the SAVILLE encryption algorithm and 16 Kbps CVSD audio compression. It replaces the Vietnam War-era NESTOR ( KY-8/ 28/ 38) family. VINSON devices
VALLOR			TTY broadcasts to submarines	AIM (2004)
WALBURN			High-bandwidth link encryption	AIM (2004) , KG-81 / 94 / 194 / 95
PADSTONE				Cypris (2 modes), Windster , Indictor
WEASEL				SafeXcel-3340

Name	Type	Specification	Use	Equipment (incomplete list)
CORDOBA				Cypris , Windster , Indictor
KEA	Asymmetric-key algorithm	R21-Tech-23-94, "Key Exchange Algorithm (KEA)"	Key exchange and digital signature algorithm for Fortezza, etc.	Fortezza, Fortezza Plus, Palladium Secure Modem
SKIPJACK	Block cipher	R21-Tech-044-91, "SKIPJACK"	Confidentiality algorithm for Fortezza, etc.	Fortezza, Fortezza Plus, Palladium Secure Modem

3 Type 3

Name	Type	Specification	Use	Equipment (incomplete list)

(Essentially by definition, there are no NSA-developed Type 4 algorithms.))

Type 1 encryption algorithms Type 2 encryption algorithms Type 3 encryption algorithms

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Topics: NSA Encryption Algorithms, Type 1, Type 2, Type 3...

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