Secure voice communication system

Details Secure voice communication system Secure voice communication system

2005-06-14

2005-06-14

Hua, Ly V. (Department: 2135)

Cryptography

Particular algorithmic function encoding

C380S277000, C380S037000, C380S275000, C380S255000, C380S269000, C380S271000, C713S171000, C713S176000, C370S335000, C705S056000

Reexamination Certificate

active

06907123

ABSTRACT:
A secure real time voice communication system70is provided that allows for the secure transmission of voice communications between a sending device72and a receiving device78through the public switch telephone network76. The device72uses an encryption decryption engine30which is capable of executing a number of encryption algorithms which are selected using an encryption selection table80. An encryption key can be calculated from a periodic key value and a public variable key value. Further, the encryption algorithm used can be periodically changed during a voice communication session so that multiple encryption techniques can be used within the same communication session.

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