Methods and systems for using keywords preprocessing, Boyer-Moore analysis, and hybrids thereof, for processing regular expressions in intrusion-prevention systems
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United States of America Patent
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Feb 23, 2016
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N/A
app pub date -
Jul 30, 2008
filing date -
Jul 31, 2007
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Abstract
Methods and systems are provided for using keyword preprocessing, Boyer-Moore analysis, and hybrids thereof, in intrusion-prevention systems. In one embodiment, a state-transition table representative of a data pattern is provided. The table has a plurality of states, each having egress events that define transitions to other states. The data pattern is parsed to identify character strings. A subject is received for evaluation, and preprocessed to find any instances of those character strings. A keyword table is populated with the character strings found during preprocessing. While using the table to evaluate the subject, a first state having a first one of the character strings as an egress event is transitioned into. The keyword table is checked for the first character string, and, responsive to finding the first character string in the keyword table, a transition is taken from the first state to the second state.
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