Information security – Monitoring or scanning of software or data including attack...
Reexamination Certificate
2004-04-14
2009-10-06
Moazzami, Nasser G (Department: 2436)
Information security
Monitoring or scanning of software or data including attack...
C726S002000, C726S003000, C726S004000, C726S016000, C726S017000, C726S021000, C726S023000, C726S026000, C726S027000, C726S030000, C713S168000, C713S179000, C380S001000, C380S059000, C709S223000, C709S224000, C715S734000, C715S736000, C370S242000, C370S245000
Reexamination Certificate
active
07600255
ABSTRACT:
Accumulated proof-of-work approaches for protecting network resources against denial-of-service attacks are disclosed. A client computer or other requester is required to perform work, such as repeatedly hashing a message until a specified number of bits is zero, as a condition for accessing a resource. Proof of the work performed by a legitimate requester is accumulated across multiple requests, so that established users of a resource are not penalized when proof-of-work is used to prevent a denial of service attack. Requesters who cannot show accumulated work greater than a specified threshold are required to perform additional work. In certain embodiments, work may be accumulated only within a specified time window, and the threshold may vary according to resource capacity or loading. Proof-of-work values may be communicated between the user and the resource in cookies.
REFERENCES:
patent: 6321339 (2001-11-01), French et al.
patent: 6944663 (2005-09-01), Schuba et al.
patent: 7197639 (2007-03-01), Juels et al.
L. Lamport, “Password Authentication with Insecure Communication,” Communications of the ACM, vol. 24, No. 11, Nov. 1981, 3 pages.
C. Dwork et al., “On Memory-bound Functions for Fighting Spam,” Crypto 2003, 17 pages.
A. Back, “Hashcash: A Denial of Service Counter Measure,” Aug. 1, 2002, 10 pages.
C. Dwork et al., “Pricing via Processing or Combating Junk Mail,” in Advances in Cryptology (E. Brickell, ed.), in CRYPTO'92, Lecture Notes in Computer Science, LNCS 740, pp. 139-147 (SpringerVerlag, Aug. 1992).
Cisco Technology Inc.
Hickman Palermo & Truong & Becker LLP
Louie Oscar A.
Moazzami Nasser G
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