Electrical computers and digital processing systems: support – Multiple computer communication using cryptography – Particular communication authentication technique
Reexamination Certificate
2004-03-22
2010-02-09
Vu, Kimyen (Department: 2435)
Electrical computers and digital processing systems: support
Multiple computer communication using cryptography
Particular communication authentication technique
C713S168000, C713S169000, C726S002000, C709S206000
Reexamination Certificate
active
07660993
ABSTRACT:
Methods and systems are provided for a cancellation server maintaining a database of identifiers of cryptographic puzzles. A cryptographic puzzle is created from a unique identifier and a timestamp, and is attached to an electronic mail message, along with the puzzle's solution. The recipient verifies that the solution is correct and that the timestamp is current, and further queries the cancellation server with the puzzle identifier. If the identifier does not exist in the database, then the recipient knows the received message is legitimate. If the identifier already appears in the database, the received message can be automatically removed from the recipient's computer.
REFERENCES:
patent: 5241599 (1993-08-01), Bellovin et al.
patent: 5537467 (1996-07-01), Cheng et al.
patent: 6134647 (2000-10-01), Acton et al.
patent: 6955605 (2005-10-01), Young et al.
patent: 7072942 (2006-07-01), Maller
patent: 7197639 (2007-03-01), Juels et al.
patent: 7337195 (2008-02-01), Hrle et al.
patent: 7475055 (2009-01-01), Hutchison et al.
patent: 2002/0069241 (2002-06-01), Narlikar et al.
patent: 2003/0233584 (2003-12-01), Doucer
patent: 2004/0093371 (2004-05-01), Burrows et al.
patent: 2004/0111484 (2004-06-01), Young et al.
patent: 2004/0181585 (2004-09-01), Atkinson et al.
patent: 2005/0050364 (2005-03-01), Feng
patent: 2005/0055410 (2005-03-01), Landsman et al.
patent: 2005/0080858 (2005-04-01), Pessach
patent: 2008/0189158 (2008-08-01), Bala et al.
picoSQL, “Query Language Reference Guide”, 2003, http://www.picosoft.it/picosql/Manuale, 26 pages, XP-002332130.
Mini SQL 2.0 User Guide, Hughes Technologies, Jul. 23, 1997, http://www.ictp.triests.it/msql/manual, XP-002332131, 78 pages.
“Software, Hardware, Services, Crypto-Anti-Spam Measures Fall Short”,Infosecurity Today, Nov. 2004, 1(6), 6, XP004659107.
Penny Black project home page—http://research.microsoft.com/research/sv/PennyBlack/, 2003.
M. Abadi, A. Birrell, M. Burrows, F. Dabek, and T. Wobber. “Bankable Postage for Network Services”, to appear, Dec. 2003.
M. Abadi, M. Burrows, M. Manasse, and T. Wobber. “Moderately Hard, Memory-bound Functions”,Proceedings of the 10th Annual Network and Distributed System Security Symposium, Feb. 2003.
A. Back, “HashCash—A Denial of Service Counter-Measure” (5 years on),Tech Report, 2002.
C. Dwork, A. Goldberg, and M. Naor, “On Memory-Bound Functions for Fighting Spam”,Proceedings of the 23rd Annual International Cryptology Conference(CRYPTO 2003), Aug. 2003.
C. Dwork and M. Naor, “Pricing via Processing or Combatting Junk Mail”,Lecture Notes in Computer Science740 (Proceedings of CRYPTO'92)}, 1993, pp. 137-147.
Stoica et al. “Chord: A Scalable Peer-to-peer Lookup Service for Internet Applications”.Proceedings of the 2001 conference on applications, technologies, architectures, and protocols for computer communications. 2001, pp. 149-160.
M. Abadi, A. Birrell, M. Burrows, F. Dabek, and T. Wobber, Bankable Postage for Network Services,Proceedings of the 8th Asian Computing Science Conference, Mumbai, India, Dec. 2003.
L. von Ahn, M. Blum, and J. Langford,Telling Humans and Computers Apart, Communications of the ACM, Feb. 2004, vol. 47. No. 2.
U.S. Appl. No. 10/291,260, filed Nov. 8, 2002, M. Abadi et al.
Birrell Andrew D.
Burrows Michael
Wobber Edward Pearce
Microsoft Corporation
Pan Joseph
Vu Kimyen
Woodcock & Washburn LLP
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