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System for obtaining signatures on a single authoritative copy of an electronic record

  • US 7,146,500 B2
  • Filed: 11/14/2001
  • Issued: 12/05/2006
  • Est. Priority Date: 11/14/2001
  • Status: Active Grant
First Claim
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1. A method for creating a unique authoritative record, obtaining and validating a digital signature on the authoritative record, and upon successful validation creating a unique revised authoritative record, comprising the steps of:

  • receiving a record in a secure environment, wherein the secure environment is connected to a network and comprises at least one server that stores and executes software;

    generating identifying information;

    generating a receipt, wherein the receipt includes a digital signature of a combination of the record and the appended identifying information;

    generating supplemental information that includes a provable representation of the receipt;

    prepending the receipt to a beginning of the record;

    appending the identifying information and supplemental information to an ending of the record;

    storing the record with prepended receipt and appended identifying information and supplemental information as the unique authoritative record;

    receiving a request to sign the authoritative record;

    computing a partially completed message digest of the authoritative record, wherein the partial message digest is related to a proper subset of the authoritative record;

    sending the partial message digest and at least a complement of the proper subset of the authoritative record to a remote location;

    completing the computation of the message digest, at the remote location, using the partial message digest, the complement of the proper subset and other identifying information;

    creating a digital signature with the use of the message digest and a private key;

    transmitting at least the digital signature and the other identifying information to the secure environment;

    validating the digital signature in the secure environment, and upon affirmative validation;

    revising the authoritative record with the digital signature and other information to create a revised authoritative record.

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