Cryptography – Key management – Having particular key generator
Reexamination Certificate
2009-01-23
2010-11-16
Korzuch, William R (Department: 2431)
Cryptography
Key management
Having particular key generator
C380S045000, C380S046000, C380S277000, C725S025000, C725S029000
Reexamination Certificate
active
07835519
ABSTRACT:
To provide a method and a system for creating a mini time key from a time key, a plurality of mini time keys are created within a unit time period. First, a unit time decryption key is prepared immediately after the unit time is created. Then, the last mini time key is created by applying a one-way function to the unit time decryption key. A desired mini time key is created by applying the one-way function to a mini time key following the desired mini time key. In other words, the mini time keys are created as a timed series arranged in a descending order beginning with the last mini time key. In this manner, even when a specific mini time key is externally leaked for a specific reason, a following mini time key in a timed series can not be created by using this mini time key. In addition, even when the mini time keys are sequentially published, the security of the unit time decryption key is maintained.
REFERENCES:
patent: 4613901 (1986-09-01), Gilhousen et al.
patent: 4926480 (1990-05-01), Chaum
patent: 5111504 (1992-05-01), Esserman et al.
patent: 5231666 (1993-07-01), Matyas
patent: 5237614 (1993-08-01), Weiss
patent: 5297207 (1994-03-01), Degele
patent: 5432852 (1995-07-01), Leighton et al.
patent: 5594794 (1997-01-01), Eyer et al.
patent: 5668877 (1997-09-01), Aziz
patent: 6031912 (2000-02-01), Moulart et al.
patent: 6560337 (2003-05-01), Peyravian et al.
patent: 6701435 (2004-03-01), Numao et al.
patent: 6735313 (2004-05-01), Bleichenbacher et al.
patent: 6799270 (2004-09-01), Bull et al.
patent: 6804355 (2004-10-01), Graunke
patent: 6816595 (2004-11-01), Kudo
patent: 7200747 (2007-04-01), Riedel et al.
patent: 7203317 (2007-04-01), Kallahalla et al.
patent: 7477738 (2009-01-01), Rajamma
patent: 7532724 (2009-05-01), Lee et al.
patent: 2005/0018842 (2005-01-01), Fu et al.
patent: 2007/0140481 (2007-06-01), Parameswaran Rajamma
patent: 2008/0205644 (2008-08-01), Lee et al.
International Business Machines - Corporation
Kinnaman, Jr. William A.
Korzuch William R
Su Sarah
LandOfFree
Mini time key creation memory medium and system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Mini time key creation memory medium and system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Mini time key creation memory medium and system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4195057