Des and other cryptographic, processes with leak minimization for smartcards and other cryptosystems

  • US 6,278,783 B1
  • Filed: 06/03/1999
  • Issued: 08/21/2001
  • Est. Priority Date: 06/03/1998
  • Status: Expired due to Term
First Claim
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1. A method for performing a cryptographic operation on a message, comprising:

  • (a) generating initial unpredictable information;

    (b) using said initial unpredictable information, transforming an initial secret quantity into a plurality of randomized quantities having a predetermined logical relationship thereamong; and

    (c) performing a first step of said operation involving said randomized quantities in a hardware device to reduce the amount of useful information about said operation available from external monitoring of said hardware device.

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