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STU-III (Secure Telephone Unit - third generation) 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 telephones, plug into a standard telephone wall jack and can make calls to any ordinary phone user (with such ...
The Librem 5 is the first phone to contain a smartcard reader, in which an OpenPGP card can be inserted for secure cryptographic operations. [14] Purism plans to use OpenPGP cards to implement storage of GPG keys, disk unlocking, secure authentication, a local password vault, protection of sensitive files, user persons, and travel persons. [36]
Zfone is software for secure voice communication over the Internet , using the ZRTP protocol. It is created by Phil Zimmermann, the creator of the PGP encryption software. Zfone works on top of existing SIP- and RTP-programs, but should work with any SIP- and RTP-compliant VoIP-program. Zfone turns many existing VoIP clients into secure phones.
In 1989 an Irish company called Intrepid developed one of the most advanced secure phones. Called "Milcode", [ 2 ] the phone was the first to implement code-excited linear prediction (or CELP) which dramatically improved voice quality and user-operability over previous LPC (Linear Predictive Coding) and LPC-10e versions.
STU-II secure telephone desk set. Electronics were housed in a separate cabinet. The STU-II (Standard Telephone Unit II) is a secure telephone developed by the U.S. National Security Agency. It permitted up to six users to have secure communications, on a time-shared (e.g.: rotating) basis. It was made by ITT Defense Communications, Nutley, New ...
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