Secure voice
Videos
Secure voice is a term in cryptography for the encryption of voice communication over a range of communication types such as radio, telephone or IP.
Gretacoder 210 secure radio system.
CVX-396 secure voice system, Crypto AG
STU-III
Videos
STU-III is a family of secure telephones introduced in 1987 by the NSA for use by the United States government, its contractors, and its allies. STU-III desk units look much like typical office teleph
Secure voice
…due to bandwidth expansion. This has led to the use of Voice Coders (vocoders) to achieve tight bandwidth compression of the speech signals. NSA's STU-III, KY-57 and SCIP are examples of systems that operate over existing voice circuits. The STE system, by contrast, requires wide bandwidth ISDN lines for…
A STU-III secure telephone (Motorola model). Crypto Ignition Key upper right.
George W. Bush using a Motorola STU-III immediately after the September 11 attacks
STU-III secure telephones on display at the National Cryptologic Museum in 2005.
KSD-64A Crypto Ignition Key