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Secure voice conferencing apparatus

  • US 5,500,899 A
  • Filed: 05/20/1982
  • Issued: 03/19/1996
  • Est. Priority Date: 05/20/1982
  • Status: Expired due to Fees
First Claim
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1. In a secure digital conferencing communications apparatus wherein each of a plurality of messages is encoded with a distinct key and then combined for simultaneous communication over a common channel,(a) a plurality of transmitters, each comprising:

  • means for generating a common, synchronous first key stream;

    means for providing a unique identifier;

    means for mixing said unique identifier with said first key stream to provide a first unique key steam;

    means for providing a first data stream, andmeans for mixing said unique key stream with said data stream to produce a unique encrypted stream,(b) transmission means for combining a plurality of said encrypted streams and for communicating them simultaneously over a common channel, and(c) a plurality of receivers, each comprising;

    means for receiving said combined encrypted streams;

    means for generating a common second key stream identical to and in synchronism with said first key stream;

    means for providing all of said unique identifiers;

    means for mixing each of said unique identifiers with said second key stream to provide a plurality of second unique key streams, each identical to each of said first unique key streams, andmeans for correlating each of said second unique key streams with said combined encrypted stream to provide a plurality of second data streams, each identical to each of said first data streams.

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