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Key distribution method

  • US 4,876,716 A
  • Filed: 08/24/1987
  • Issued: 10/24/1989
  • Est. Priority Date: 08/22/1986
  • Status: Expired due to Term
First Claim
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1. A key distribution method comprising the following steps:

  • (a) generating a first random number in a first system in use by a first converser;

    (b) generating first key distribution information in said first system by applying a predetermined first transformation to said first random number on the basis of first secret information;

    (c) transmitting said first key distribution information to a second system in use by a second converser via a communication channel;

    (d) receiving said first key distribution information in said second system;

    (e) generating a second random number in said second system;

    (f) generating second key distribution information by applying said predetermined first transformation to said second random number on the basis of second secret information;

    (g) transmitting said second key distribution information to said first system via said communication channel;

    (h) receiving said second key distribution information in said first system; and

    (i) generating an enciphering key in said first system by applying a predetermined second transformation to said second key distribution information on the basis of said first random number and identification information of said second converser.

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