Time stamping method employing multiple receipts linked by a nonce
First Claim
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1. A method for time-stamping a digital document comprising:
- receiving identifying data derived from a document at an outside agency;
creating at said outside agency a first receipt based on said identifying data;
creating at said outside agency a second receipt, different from said first receipt, based on a time indication that indicates when the document was received at the outside agency;
inserting a linking value into said first and second receipts that links the identifying data in the first receipt with the time indication in the second receipt;
certifying said first and second receipts at said outside agency using a cryptographic signature scheme.
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Abstract
A method for time stamping a digital document employs a two-part time stamp receipt. The first part of the time stamp receipt includes identifying data associated with a document and a nonce. The second part of the time stamp receipt includes a time indication and the nonce. The nonce serves as a link between the first and second parts.
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Citations
19 Claims
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1. A method for time-stamping a digital document comprising:
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receiving identifying data derived from a document at an outside agency; creating at said outside agency a first receipt based on said identifying data; creating at said outside agency a second receipt, different from said first receipt, based on a time indication that indicates when the document was received at the outside agency; inserting a linking value into said first and second receipts that links the identifying data in the first receipt with the time indication in the second receipt; certifying said first and second receipts at said outside agency using a cryptographic signature scheme. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for time-stamping a digital document comprising:
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transmitting identifying data derived from said document to an outside agency; receiving from said outside agency a first receipt signed by said outside agency using a cryptographic signature scheme, said first receipt including a first digital sequence generated based on said identifying data; receiving from said outside agency a second receipt signed by said outside agency using a cryptographic signature scheme, said second receipt being different from said first receipt and containing a second digital sequence based on a time indication that indicates when the document was received at the outside agency; and wherein said first and second receipts comprise a linking value that links the identifying data in the first receipt with said time indication in the second receipt. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification
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Current AssigneeInternational Business Machines Corporation
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Original AssigneeInternational Business Machines Corporation
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InventorsPeyravian, Mohammad, Zunic, Nevenko, Roginsky, Allen, Matyas, Stephen M. Jr.
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Primary Examiner(s)Revak; Christopher A
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Assistant Examiner(s)Moorthy; Aravind K
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Application NumberUS09/458,410Time in Patent Office3,413 DaysField of Search707/100, 715/513, 380/283, 713/157, 713/178US Class Current713/178CPC Class CodesH04L 2209/60 Digital content management,...H04L 9/3297 involving time stamps, e.g....
