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Method and apparatus for initialization of cryptographic terminal

  • US 5,745,576 A
  • Filed: 05/17/1996
  • Issued: 04/28/1998
  • Est. Priority Date: 05/17/1996
  • Status: Expired due to Term
First Claim
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1. A method for initializing a cryptographic terminal in a cryptographic system with an operational key comprising the steps of:

  • defining a base key for a cryptographic system;

    storing said base key in a controller of said cryptographic system;

    deriving an initial terminal key for a cryptographic terminal having a unique identifying number, said initial terminal key derived using said base key and said unique identifying number;

    storing said initial terminal key in said cryptographic terminal;

    establishing communication between said controller and said cryptographic terminal;

    sending said unique identifying number from said cryptographic terminal to said controller;

    at said controller, using a first processing means, deriving an expected initial terminal key using said unique identifying number and said base key;

    encrypting a challenge message at said controller using said expected initial terminal key and transmitting said encrypted challenge message to said cryptographic terminal;

    at said cryptographic terminal, using a second processing means, decrypting said encrypted challenge message using said initial terminal key;

    encrypting a response message at said cryptographic terminal using said initial terminal key and transmitting said encrypted response message to said controller;

    comparing said encrypted response message at said controller to an expected response message;

    verifying said cryptographic terminal as an authentic cryptographic terminal when said response message matches said expected response message.

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