Method for point-to-point communications within secure communication systems

CAFC
  • US 5,357,571 A
  • Filed: 07/01/1993
  • Issued: 10/18/1994
  • Est. Priority Date: 07/01/1993
  • Status: Expired due to Term
First Claim
Patent Images

1. In a secure communication system that includes a plurality of communication units, wherein each communication unit of the plurality of communication, units stores a limited set of encryption key variables, a method for providing a point-to-point communication within the secure communication system, the method comprises the steps of:

  • a) receiving, by a first communication unit of the plurality of communication units, a request for the point-to-point communication from an operator of the first communication unit, wherein the request identifies at least one destination communication unit;

    b) generating, by the first communication unit, a private;

    call key variable by modifying an encryption key variable of the limited set of encryption key variables based on a predetermined function;

    c) transmitting, by the first communication unit to the at least one destination communication unit, identity of the encryption key variable and information pertaining to the predetermined function;

    d) generating, by the at least one destination communication unit, the private call key variable based on the encryption key variable and the information pertaining to the predetermined function; and

    e) privately communicating between the first communication unit and the at least one destination communication unit using the private call key variable.

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