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Method and apparatus for providing privacy/security in a communication system

  • US 4,972,479 A
  • Filed: 07/10/1987
  • Issued: 11/20/1990
  • Est. Priority Date: 07/10/1987
  • Status: Expired due to Fees
First Claim
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1. Communications system security apparatus adapted for coupling to first and second communications channels each comprising public subscriber lines having first and second ends, said first ends being at a network switch, said apparatus comprising:

  • diverter means for establishing an unencrypted communications path between said second ends of said first and second channels in response to signals received over said channels;

    encryption means having first and second terminals for encrypting signals received at said second terminal and supplying said encrypted signals to said first terminal, and for decrypting signals received at said first terminal and supplying said decrypted signals to said second terminal; and

    coupling means responsive to an activation signal for selectively coupling said encryption means to said diverter means such that said first terminal is coupled to said first channel second end and said second terminal is coupled to said second channel second end, whereby encrypted signals received at said first channel second end are transmitted in decrypted form over said second channel and signals received at said second channel second end are transmitted over said first channel in encrypted form.

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