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Digital signature with auditing bits

  • US 5,956,404 A
  • Filed: 09/30/1996
  • Issued: 09/21/1999
  • Est. Priority Date: 09/30/1996
  • Status: Expired due to Term
First Claim
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1. A method for performing a cryptographically assured electronic transaction requested by a user module, and providing multiple independent audit trails therefor, comprising the steps performed by an application module of:

  • (a) cryptographically interlocking with a user module;

    (b) receiving, from said user module, a cryptographically verifiable transaction request;

    (c) cryptographically verifying said received transaction request;

    (d) electronically performing said transaction;

    (e) logging said performed transaction as part of a digitally signed hash chain including at least one previously performed transaction, to provide a first cryptographically assured audit trail of said transaction;

    (f) cryptographically interlocking with an auditing module separate from said application module; and

    (g) transmitting said hash chain to said auditing module, to provide thereat a second cryptographically assured audit trail of said transaction, independent of said first audit trail in said application module.

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