Time stamping method using time delta in key certificate
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United States of America Patent
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May 25, 2004
Grant Date -
N/A
app pub date -
Dec 10, 1999
filing date -
Dec 10, 1999
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A method for time stamping a digital document is disclosed. The document originator creates a time stamp receipt by combining the document and a digital time indication. The time stamp receipt is submitted to a time stamping agent having a trusted clock. The time stamping agent optionally validates the time stamp receipt and then computes the age of the time stamp receipt. If valid, the time stamping agent certifies the time stamp receipt by signing the time stamp receipt with a private signature key. The private signature key is selected from a group of signature keys by the time stamping agent based on the computed age of the time stamp receipt.
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