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  2. Secure voice - Wikipedia

    en.wikipedia.org/wiki/Secure_voice

    A digital secure voice usually includes two components, a digitizer to convert between speech and digital signals and an encryption system to provide confidentiality. It is difficult in practice to send the encrypted signal over the same voiceband communication circuits used to transmit unencrypted voice, e.g. analog telephone lines or mobile radios, due to bandwidth expansion.

  3. Vocoder - Wikipedia

    en.wikipedia.org/wiki/Vocoder

    A vocoder (/ ˈ v oʊ k oʊ d ər /, a portmanteau of voice and encoder) is a category of speech coding that analyzes and synthesizes the human voice signal for audio data compression, multiplexing, voice encryption or voice transformation. The vocoder was invented in 1938 by Homer Dudley at Bell Labs as a means of synthesizing human speech. [1]

  4. VINSON - Wikipedia

    en.wikipedia.org/wiki/VINSON

    VINSON is a family of voice encryption devices used by U.S. and allied military and law enforcement, based on the NSA's classified Suite A SAVILLE encryption algorithm and 16 kbit/s CVSD audio compression. It replaces the Vietnam War-era NESTOR (KY-8/KY-28|28/KY-38|38) family.

  5. ARINC - Wikipedia

    en.wikipedia.org/wiki/ARINC

    ARINC 767 defines a combined recorder unit capable of data and voice; ... ARINC 823 is a standard for end-to-end datalink encryption.

  6. KY-58 - Wikipedia

    en.wikipedia.org/wiki/KY-58

    KY-58 VINSON at the National Cryptologic Museum. The VINSON KY-58 is a secure voice module primarily used to encrypt radio communication to and from military aircraft and other tactical vehicles.

  7. Comparison of audio coding formats - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_audio_coding...

    voice recording, audio No No No Yes No G.723.1: ITU-T 1996-03 G.723.1 (05/06) Non-free Various proprietary VoIP software FFmpeg voice recording: No Yes No Yes No G.726: ITU-T 1990-12 Free Various proprietary VoIP software FFmpeg, Ekiga and other VoIP software voice recording: No Yes No No No G.728: ITU-T 1992-09 Non-free Various proprietary ...

  8. NSA encryption systems - Wikipedia

    en.wikipedia.org/wiki/NSA_encryption_systems

    The first tactical secure voice equipment was the NESTOR family, used with limited success during the Vietnam war. Other NSA voice systems include: [1]: Vol I, p.57ff STU I and STU II — These systems were expensive and cumbersome and were generally limited to the highest levels of command

  9. Secure Communications Interoperability Protocol - Wikipedia

    en.wikipedia.org/wiki/Secure_Communications...

    SCIP was designed by the Department of Defense Digital Voice Processor Consortium (DDVPC) in cooperation with the U.S. National Security Agency and is intended to solve problems with earlier NSA encryption systems for voice, including STU-III and Secure Terminal Equipment (STE) which made assumptions about the underlying communication systems ...

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