Time stamping method using aged time stamp receipts

Details Time stamping method using aged time stamp receipts Time stamping method using aged time stamp receipts

2006-01-31

2006-01-31

Song, Hosuk (Department: 2135)

Electrical computers and digital processing systems: support

Multiple computer communication using cryptography

Particular communication authentication technique

C713S170000, C713S181000

Reexamination Certificate

active

06993656

ABSTRACT:
A method for time stamping a digital document is disclosed. The document originator creates a time stamp receipt by combining the document or other identifying data and a digital time indication. The time stamp receipt is submitted to a time stamping authority having a trusted clock. The time stamping authority optionally validates the time stamp receipt and then computes the age of the time stamp receipt. The time stamping authority creates an aged time stamp receipt by combining the identifying data and time indication contained in the submitted time stamp receipt with the computed age of the time stamp receipt. The time stamping authority cryptographically binds the time information and identifying data in the aged time stamp receipt, e.g., by signing the combination of the identifying data, time indication, and computed age with a private signature generation key.

REFERENCES:
patent: 5001752 (1991-03-01), Fischer
patent: 5136646 (1992-08-01), Haber et al.
patent: 5136647 (1992-08-01), Haber et al.
patent: 5189700 (1993-02-01), Blandford
patent: 5373561 (1994-12-01), Haber et al.
patent: RE34954 (1995-05-01), Haber et al.
patent: 5471631 (1995-11-01), Beardsley et al.
patent: 5638443 (1997-06-01), Stefik et al.
patent: 5781629 (1998-07-01), Haber et al.
patent: 6209090 (2001-03-01), Aisenberg et al.
patent: 6381696 (2002-04-01), Doyle
patent: 6393566 (2002-05-01), Levine
patent: 6530023 (2003-03-01), Nissl et al.
patent: 6574627 (2003-06-01), Bergadano et al.
patent: 2001/0011350 (2001-08-01), Zabetian
patent: WO 99/16209 (1999-04-01), None
Stuart Haber et al, How to Time-Stamp a Digital Document, Aug. 1990, Advances in Cryptology—CRYPTO '90 Proceedings, p. 437-455.
Akira Takura et al, A Secure and Trusted Time Stamping Authority, 1999, IEEE, p. 88-93.
Bruce Schneier, Applied Cryptography, 1996, John Wiley & Sons, Inc., Second Edition, p. 455-459.

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