Electrical computers and digital processing systems: support – Multiple computer communication using cryptography – Particular communication authentication technique
Reexamination Certificate
2005-08-16
2005-08-16
Barrón, Gilberto (Department: 2132)
Electrical computers and digital processing systems: support
Multiple computer communication using cryptography
Particular communication authentication technique
C713S180000
Reexamination Certificate
active
06931537
ABSTRACT:
In a time stamping system formed by a client device and a server device, the client device includes a digest generation unit for generating a plurality of digests for a plurality of digital documents, a digest combining unit for combining the plurality of digests generated by the digest generation unit, a unified digest generation unit for generating a unified digest from the plurality of digests as combined by the digest combining unit, a transmission unit for transmitting a time stamping request containing the unified digest generated by the unified digest generation unit, to the server device, and a reception unit for receiving a time stamp token for the plurality of digital documents from the server device. The server device generates the time stamp token containing a time stamped digital document obtained by combining the unified digest and a time information acquired in response to the time stamping request, and a digital signature for the time stamped digital document.
REFERENCES:
patent: 5001752 (1991-03-01), Fischer
patent: 5022080 (1991-06-01), Durst
patent: 5136643 (1992-08-01), Fischer
patent: 5136646 (1992-08-01), Haber
patent: 5136647 (1992-08-01), Haber
patent: 5422953 (1995-06-01), Fischer
patent: 5625693 (1997-04-01), Rohatgi et al.
patent: 5768382 (1998-06-01), Schneier et al.
patent: 5768389 (1998-06-01), Ishii
patent: 5781629 (1998-07-01), Haber
patent: 5958051 (1999-09-01), Renaud et al.
patent: 6601172 (2003-07-01), Epstein
patent: 2301919 (1996-12-01), None
patent: 6-501571 (1994-02-01), None
patent: 10039753 (1998-02-01), None
patent: 10105057 (1998-04-01), None
patent: 10-105057 (1998-04-01), None
patent: 10207360 (1998-08-01), None
patent: 10-326078 (1998-12-01), None
patent: 2000-235340 (2000-08-01), None
patent: WO 92/03000 (1992-02-01), None
patent: WO92/03000 (1992-02-01), None
patent: WO 98/39876 (1998-09-01), None
patent: WO 99/35785 (1999-07-01), None
Stallings, William; Cryptography and Network Security; Jun. 4, 1998; Prentice-Hall, Inc.; 2ndEdition; pp. 299-319.
Schneier, Bruce; Applied Cryptography; 1996; John Wiley & Sons, Inc.; 2ndEdition; pp. 47-100.
Ono Satoshi
Takura Akira
Barrón Gilberto
Holmes Brenda O.
Kilpatrick & Stockton LLP
Kim Jung Woo
Nippon Telegraph & Telephone Corporation
LandOfFree
Folder type time stamping system and distributed time... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Folder type time stamping system and distributed time..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Folder type time stamping system and distributed time... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3459387