The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 04, 2007
Filed:
Mar. 08, 2004
Marc A. Norton, Eldersburg, MD (US);
Daniel J. Roelker, Arlington, VA (US);
Marc A. Norton, Eldersburg, MD (US);
Daniel J. Roelker, Arlington, VA (US);
Sourcefire, Inc., Columbia, MD (US);
Abstract
Performance of an intrusion detection system is enhanced with the addition of rule optimization, set-based rule inspection, and protocol flow analysis. During rule optimization, rule sets are created and selected in such a way that for every incoming packet only a single rule set has to be searched. Set-based rule inspection divides rules into content and non-content type rules. Only search patterns of content type rules are initially compared to a packet. Rules containing matched search patterns are validated with a parameterized search against the packet. Matches are recorded as events. Non-content rules are searched against a packet using a parameterized search. These matches are also recorded as an event. At least one event is selected per packet for logging. Protocol flow analysis determines the direction of flow of network traffic. Based on the direction of flow and the protocol, portions of packets can be eliminated from rule inspection.