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Method and Apparatus for Dynamic Generation of Symmetric Encryption Keys and Exchange of Dynamic Symmetric Key Infrastructure

  • US 20100195824A1
  • Filed: 02/02/2010
  • Published: 08/05/2010
  • Est. Priority Date: 10/26/2001
  • Status: Abandoned Application
First Claim
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1. A method (50) for generating dynamic encryption keys for encrypting data files using detachable token devices, comprising:

  • (a) coupling (54) a detachable token device (30) to a computer (14), wherein said token device comprises symmetric shared secrets previously embedded in a key storage region (39), and an on-board processor (32) for advanced encryption standard (AES) processing (70);

    (b) using said computer (14) to generate (58) a challenge in the form of a number chosen from the group consisting of a challenge puzzle, a key ID, a random number, and a user code;

    (c) transmitting (58) the challenge to the token device (30);

    (d) using said token device to generate (68) an encrypted puzzle key responsive to receipt of the challenge and said symmetric shared secrets;

    (e) using said token device to generate a dynamic file key (71) based upon the encrypted puzzle key and challenge;

    (f) encrypting a data file with the dynamic file key after decomposing said file into data blocks (74) and generating encrypted data blocks (74E); and

    (g) appending decryption information (78) to an encrypted data file (53E).

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