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Using unpredictable information to minimize leakage from smartcards and other cryptosystems

DC
  • US 6,327,661 B1
  • Filed: 06/03/1999
  • Issued: 12/04/2001
  • Est. Priority Date: 06/03/1998
  • Status: Expired due to Term
First Claim
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1. A cryptographic processing device for securely performing a cryptographic processing operation including a sequence of instructions in a manner resistant to discovery of a secret by external monitoring, comprising:

  • (a) an input interface for receiving a quantity to be cryptographically processed, said quantity being representative of at least a portion of a message;

    (b) a source of unpredictable information;

    (c) a processor;

    (i) connected to said input interface for receiving and cryptographically processing said quantity, (ii) configured to use said unpredictable information to conceal a correlation between externally monitorable signals and said secret during said processing of said quantity by modifying said sequence; and

    (d) an output interface for outputting said cryptographically processed quantity to a recipient thereof.

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