Intrusion detection method and signature table

Details Intrusion detection method and signature table Intrusion detection method and signature table

2006-12-12

2006-12-12

Sheikh, Ayaz (Department: 2131)

Information security

Monitoring or scanning of software or data including attack...

Intrusion detection

C726S021000, C726S022000, C726S025000, C726S026000, C726S006000, C726S007000, C713S150000, C713S155000, C713S164000, C713S168000, C709S200000, C709S220000, C709S223000, C709S224000, C709S225000, C709S229000

Reexamination Certificate

active

07150043

ABSTRACT:
Performance of a pattern-matching intrusion detection system (IDS) is improved by ranking signatures in its signature table by likelihood of occurrence, so that the table may be searched efficiently. Occurrence data associated with signatures is kept, and the ranking adaptively revised according to updates of the data. When the IDS detects a system event, the signature table is searched. If the search does not find a signature matching the event, thereby suggesting that the event poses no threat, a null signature is added to the signature table in a strategic location to terminate future searches early. In one embodiment, null signatures may be stored in a cache. When a system event is detected, the cache is searched. If a match is not found, the signature table is searched. If a match is not found in the signature table, a null signature is cached.

REFERENCES:
patent: 6279113 (2001-08-01), Vaidya
patent: 6681331 (2004-01-01), Munson et al.
patent: 2002/0112185 (2002-08-01), Hodges

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