KY-3

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Two stacked KY-3s at the NSA's National Cryptologic Museum

The KY-3 (TSEC/KY-3) is a secure telephone system developed by the U.S. National Security Agency in the early 1960s. The "TSEC" prefix to the model number indicates NSA's Telecommunications Security nomenclature system.

According to information on display in 2002 at the NSA's National Cryptologic Museum, the KY-3 provided high fidelity secure voice over special wideband circuits known as "4-wire dedicated drops". It was used by executives, diplomats, military leaders and the intelligence community. Some 2500 units were produced between 1965 and 1967 and it was one of the first telecommunication security devices to use transistors packaged into functional modules. The unit was packaged in a grey relay rack cabinet. The KY-3 was replaced by the STU-I and STU-II.

External links

Delusion.org - National Cryptologic Museum pictures

v t e Cipher machines

Rotor machines:	CCM Enigma M – 125 Fialka Hebern HX-63 KL-7 Lacida M-325 Mercury NEMA OMI Portex RED 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

Secure voice:	BID 150 FASCINATOR KY-3 KY-57 KY-58 KY-68 OMNI SCIP Sectéra Secure Module SIGSALY STE STU-II STU-III VINSON

Miscellaneous:	JADE KG-84 KL-43 Noreen PURPLE Pinwheel Rockex

v t e Cryptography

History of cryptography Cryptanalysis Cryptography portal Outline of cryptography

Symmetric-key algorithm Block cipher Stream cipher Public-key cryptography Cryptographic hash function Message authentication code Random numbers Steganography

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KY-3

External links

See also