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Efficient and secure data currentness systems

  • US 7,657,751 B2
  • Filed: 05/13/2004
  • Issued: 02/02/2010
  • Est. Priority Date: 05/13/2003
  • Status: Expired due to Fees
First Claim
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1. A method of conveying currentness information about a document that is one of a plurality of documents, comprising:

  • at every date j of a sequence of dates, and for every document i of the plurality of documents, having a currentness authority compute individual currentness status information Ci about i by digitally signing information identifying i, date j and an indication whether i continues to be valid, or is obsolete, or is suspended, wherein the currentness authority computes the individual currentness status information Ci independently of a request for the document i;

    providing the digitally signed currentness status information Ci to a responder, wherein the responder is a non-trusted relay of the digitally signed currentness status information Ci;

    for each document i in a plurality of documents, having the responder store the latest received Ci; and

    in response to an inquiry about currentness status of document i, having the responder provide the latest received Ci.

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