Cryptography – Electric signal modification – Having production of printed copy
Patent
1996-03-21
1999-07-13
Gregory, Bernarr E.
Cryptography
Electric signal modification
Having production of printed copy
380 3, 380 4, 380 23, 380 25, 380 49, 380 54, 380 59, H04L 900
Patent
active
059237635
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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Jorasch James A.
Schneier Bruce
Walker Jay S.
Gregory Bernarr E.
Walker Asset Management Limited Partnership
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