Ciphony Guide, Meaning , Facts, Information and Description

Ciphony refers to secure voice communication. A ciphony system usually includes two components, a digitizer to convert between speech and digital signals and an encryption system to provide confidentiality. What makes ciphony difficult in practice is a need to send the the encrypted signal over the same circuits used to transmit unencrypted voice, e.g. telephones or mobile radios. This leads to the use of vocoders to achieve tight bandwidth compression of the speech signals. NSA's STU-III, KY-57 and FNBDT are examples of ciphony systems that operate over existing voice circuits. The STE system, by contrast, requires wide bandwidth ISDN lines for its normal mode of operation.

See also

• Scrambler
• NSA encryption systems

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