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File encryption method and system

DC
  • US 6,049,612 A
  • Filed: 12/28/1998
  • Issued: 04/11/2000
  • Est. Priority Date: 03/10/1997
  • Status: Expired due to Term
First Claim
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1. A method of protecting an information file from unauthorized access, which comprises the following steps:

  • combining a constant value and a secret plural bit sequence in accordance with an algebraic function to shuffle bits, perform a first many-to-few bit mapping, and produce a first pseudo-random result;

    performing a secure hash operation on said first pseudo-random result to effect a second many-to-few bit mapping and produce a second pseudo-random result;

    extracting a pseudo-random, symmetric encryption key from said second pseudo-random result;

    encrypting said information file in accordance with said pseudo-random, symmetric encryption key to form an encrypted information file; and

    concatenating said constant value to a beginning of said encrypted information file.

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