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KL-51

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Keyboard encryption system

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KL-51 on display at theNational Cryptologic Museum in 2005

TheKL-51 is an off-line keyboardencryption system that read and punchedpaper tape for use withteleprinters. InNATO it was calledRACE (Rapid Automatic Cryptographic Equipment).

It was developed in the 1970s by aNorwegian company,Standard Telefon og Kabelfabrik (STK). It used digital electronics for encryption instead of rotors, and it may have been the first machine to use software based crypto algorithms. KL-51 is a very robust machine made to military specifications.

U.S.National Security Agency bought it in the 1980s to replace the earlierKL-7. As of 2006, the U.S. Navy was developing plans to replace KL-51 units still in use with a unit based on a more modernUniversal Crypto Device.^[1]

References

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^"Archived copy"(PDF). Archived fromthe original(PDF) on 2011-05-22. Retrieved2008-05-29.{{cite web}}: CS1 maint: archived copy as title (link)

Sources

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NSA museum caption shown in photo.
Crypto Machines - KL-51/RACE
http://www.knobstick.ca/pdf_files/race1.pdf

v t e Cipher machines
Rotor machines	CCM Enigma M-125 Fialka Hebern HX-63 KL-7 Lacida M-325 Mercury NEMA OMI RED SG-39 SG-41 SIGABA SIGCUM Singlet Typex
Mechanical	Bazeries cylinder C-36 C-52 CD-57 Cipher disk HC-9 Kryha Jefferson disk M-94 M-209 Reihenschieber Scytale
Teleprinter	5-UCO BID 770 DUDEK KW-26 KW-37 Lorenz SZ 40/42 Siemens and Halske T52 SIGTOT
Secure voice	BID 150 FASCINATOR KY-3 KY-58 KY-68 NESTOR OMNI SCIP Sectéra Secure Module SIGSALY STE STU-II STU-III VINSON
Other	JADE KG-84 KL-43 KL-51 Noreen Red Purple Pinwheel Rockex
Computer hardware	AES instruction set Intel SHA extensions IBM 4758 IBM 4764

v t e Cryptography
General	History of cryptography Outline of cryptography Classical cipher Cryptographic protocol Authentication protocol Cryptographic primitive Cryptanalysis Cryptocurrency Cryptosystem Cryptographic nonce Cryptovirology Hash function Cryptographic hash function Key derivation function Secure Hash Algorithms Digital signature Kleptography Key (cryptography) Key exchange Key generator Key schedule Key stretching Keygen Machines Ransomware Random number generation Cryptographically secure pseudorandom number generator (CSPRNG) Pseudorandom noise (PRN) Secure channel Insecure channel Subliminal channel Encryption Decryption End-to-end encryption Harvest now, decrypt later Information-theoretic security Plaintext Codetext Ciphertext Shared secret Trapdoor function Trusted timestamping Key-based routing Onion routing Garlic routing Kademlia Mix network
Mathematics	Cryptographic hash function Block cipher Stream cipher Symmetric-key algorithm Authenticated encryption Public-key cryptography Quantum key distribution Quantum cryptography Post-quantum cryptography Message authentication code Random numbers Steganography
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