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Remote key manipulations for over-the-air re-keying

  • US 5,146,498 A
  • Filed: 01/10/1991
  • Issued: 09/08/1992
  • Est. Priority Date: 01/10/1991
  • Status: Expired due to Term
First Claim
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1. A method for remotely changing an original voice encryption key in a secure radio, comprising:

  • storing said original voice encryption key in said secure radio;

    transmitting by a central controller to said secure radio a digital word representing only a selective operation selectable from a plurality of different key operations to be performed on said original voice encryption key alone without changing an encryption polynomial; and

    performing only said operation on said original voice encryption key alone in said secure radio to generate a current voice encryption key alone in response to said digital word.

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