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Reference.org
Secure voice
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<p>Secure voice (alternatively secure speech or ciphony) is a term in <a href="/facts/Cryptography/e94PEVau">cryptography</a> for the encryption of <a href="/facts/Voice_communication/WEelhfTs">voice communication</a> over a range of communication types such as radio, <a href="/facts/Telephone/P7uEgWQX">telephone</a> or <a href="/facts/Voice_over_IP/5QGBbXYg">IP</a>. </p>