Electrical computers and digital processing systems: support – Multiple computer communication using cryptography – Particular communication authentication technique
Reexamination Certificate
2008-05-16
2011-10-04
Barron, Jr., Gilberto (Department: 2432)
Electrical computers and digital processing systems: support
Multiple computer communication using cryptography
Particular communication authentication technique
C380S028000
Reexamination Certificate
active
08032757
ABSTRACT:
Processes for fingerprinting a document and for preventing information leakage at a deployment point are disclosed. For fingerprinting a document, a sequence of hash values for a document is generated, a portion of said hash values to be selected as fingerprints for the document. A current window is positioned over a portion of the sequence of hash values. The hash values are examined starting from one end of the current window, and a first-encountered hash value that is 0 modulo P is selected to be a fingerprint for the current window. For information leakage prevention at a deployment point, a rolling hash calculation is performed on a target document, and a determination is made if a hash value is 0 modulo P. A first filter is applied if the hash value is 0 modulo P, and a second filter is otherwise applied. Other embodiments, aspects and features are also disclosed.
REFERENCES:
patent: 6611213 (2003-08-01), Bentley et al.
patent: 7503035 (2009-03-01), Zeidman
patent: 7702614 (2010-04-01), Shah et al.
patent: 2003/0120647 (2003-06-01), Aiken et al.
patent: 2005/0091234 (2005-04-01), Hsu et al.
patent: 2008/0028468 (2008-01-01), Yi et al.
patent: 2008/0033942 (2008-02-01), Kao et al.
patent: 2009/0024826 (2009-01-01), Zhang et al.
Saul Schleimer, et al. “Winnowing: Local Algorithms for Document Fingerprinting”, SIGMOD 2003, Jun. 9-12, 2003, 10 sheets.
Bloom Filters—the math, pp. 1-6, [retrieved on May 06, 2008]. Retrieved from the internet: http://pages.cs.wisc.edu/cao/papers/summary-cache
ode8.html, dated 1998.
Chen Gang
Dong Kan
Zhao Xiaoming
Barron Jr. Gilberto
Nobahar Abdulhakim
Okamoto & Benedicto LLP
Trend Micro Incorporated
LandOfFree
Methods and apparatus for content fingerprinting for... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Methods and apparatus for content fingerprinting for..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Methods and apparatus for content fingerprinting for... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4278297