Method and apparatus for secure document timestamping
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United States of America Patent
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Jul 13, 1999
Grant Date -
N/A
app pub date -
Mar 21, 1996
filing date -
Mar 21, 1996
priority date (Note) -
In Force
status (Latency Note)
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Abstract
The invention relates devices and methods for creating a cryptographically assured timestamp that can be verified by a party that was not present during the creation of the timestamp. The timestamp is applied to physical documents, and other substrates capable of receiving an optically detectable mark, that are to be transmitted to temporally or spatially distant recipients.
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