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Method for making secure one or several computer installations using a common secret key algorithm, use of the method and a computer system utilizing the method

  • US 7,050,581 B1
  • Filed: 04/07/2000
  • Issued: 05/23/2006
  • Est. Priority Date: 04/09/1999
  • Status: Expired due to Fees
First Claim
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1. A method for protecting one or more computer systems using the same secret key (Ks) cryptographic algorithm, each computer system having storage means for storing the secret key (Ks) and processing means for executing the cryptographic algorithm, the method comprising:

  • storing a secret data (Ds) in a secret area of the storage means;

    separating a standard cryptographic algorithm into a plurality of simultaneous calculation processes based on the secret data (Ds);

    creating a plurality of partial intermediate variables corresponding to each intermediate variable of the standard cryptographic algorithm;

    applying nonlinear transformations to each of the plurality of partial intermediate variables to create a plurality of partial results; and

    reconstituting a final result, corresponding to a result of the standard cryptographic algorithm, from the plurality of partial results.

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