Time stamping system for electronic documents and program...

Details Time stamping system for electronic documents and program... Time stamping system for electronic documents and program...

2007-09-04

2007-09-04

Moise, Emmanuel L. (Department: 2137)

Electrical computers and digital processing systems: support

Multiple computer communication using cryptography

Particular communication authentication technique

C713S168000, C713S176000, C705S067000, C705S075000

Reexamination Certificate

active

10339466

ABSTRACT:
A time stamping system for electronic documents has a document preparation device and a time stamp issuing server. The document preparation device includes an electronic document reading device that reads an electronic document. A digest value computer computes a digest value based on the read document. A transmitter transmits the computed digest value to the time stamp server with a request for a time stamp. A receiver receives the requested time stamp from the time stamp server and an electronic writer writes the received time stamp into the electronic document.

REFERENCES:
patent: 5422953 (1995-06-01), Fischer
patent: 6587945 (2003-07-01), Pasieka
patent: 6816969 (2004-11-01), Miyazaki et al.
patent: WO9203000 (1992-02-01), None
Schneier, Applied Cryptography, Second edition, John Wiley and Sons, Inc. p. 17.
Schneier, Applied Cryptography, 1996, Second Edition, John Wiley and Sons, Inc., p. 17 (This is the supplemental non-patent documents submitted with the office action dated May 26, 2006).

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