Generating and verifying trusted digital time stamp
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United States of America Patent
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Feb 15, 2011
Grant Date -
Nov 20, 2008
app pub date -
May 20, 2008
filing date -
Jan 13, 2004
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Methods, apparatus and systems for generating a trusted digital time stamp as well as a public time source. It includes, an apparatus for receiving and recording public time information and a method for verifying a digital time stamp. A method for generating a trusted digital time stamp includes: obtaining a first time information and a corresponding random code from a public time source; and generating a digital time stamp using a first time information and random code. A method for verifying a digital time stamp includes: recording time information and corresponding random codes transmitted by a public time source; retrieving time information and a random code contained in the time stamp; and comparing a retrieved random code from the time stamp with one of the recorded random codes that corresponds to a time information in the time stamp, if they are consistent, the time stamp is determined to be trusted, otherwise the time stamp is determined to be not trusted.
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