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1 2003

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Fast Multipattern Search Algorithms for Intrusion Detection

Kuri J., Navarro G., Mé L.

Fundamenta Informaticae

2003

Vol. 56, nr 1,2

23-49

We present new search algorithms to detect the occurrences of any pattern from a given pattern set in a text, allowing in the occurrences a limited number of spurious text characters among those of the pattern. This is a common requirement in intrusion detection applications. Our algorithms exploit the ability to represent the search state of one or more patterns in the bits of a single machine word and update all the search states in a single operation. We show analytically and experimentally that the algorithms are able of fast searching for large sets of patterns allowing a wide number of spurious characters, yielding in our machine about a 75-fold improvement over the classical dynamic programming algorithm.