Electrical computers and digital processing systems: support – Multiple computer communication using cryptography – Particular communication authentication technique
Reexamination Certificate
2007-11-27
2007-11-27
Barron, Gilberto (Department: 2132)
Electrical computers and digital processing systems: support
Multiple computer communication using cryptography
Particular communication authentication technique
C382S282000, C382S288000, C382S290000, C382S291000
Reexamination Certificate
active
10248138
ABSTRACT:
Methods and systems for authenticating documents. Document data to be modified to contain authentication is inputted. A representation is determined from the document data. Assist information that is usable to reliably recover a determined representation is determined. A one-way hash of the representation and assist information is determined. The one-way hash is then cryptographically signed. The assist information and digitally signed one-way hash is then appended to the document.
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Bern Marshall W.
Goldberg David
Greene Daniel H.
Barron Gilberto
Herring Virgil
Oliff & Berridg,e PLC
XEROX Corporation
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