STU-II

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STU-II secure telephone desk set. Electronics were housed in a separate cabinet.

The STU-II is a secure telephone developed by the U.S. National Security Agency. It was made by ITT-Defense Communications, Nutley, New Jersey. An OEM partner was Northern Telecom.

According to information on display in 2005 at the NSA's National Cryptologic Museum, the STU-II was in use from the 1980s to the present. It uses the linear predictive coding algorithm LPC-10 at 2.4 kilobits/second, and the "Key Development Center" for key management. The display also stated that the STU-II B is the standard narrow band secure telephone.

STU-II replaced the STU-I, KY-3 and the Navajo I. The last was a secure telephone in a briefcase, of which 110 were built in the 1980s for use by senior government officials when traveling. It also used LPC-10.

Some 10 000 STU-II units were produced.

STU-II cabinet with desk set on top.

[edit] External links

• Delusion.org - National Cryptologic Museum pictures

[edit] See also

• STU-III
• SCIP