Abstract-The Aho-Corasick (AC) algorithm is a very flexible and efficient but memory-hungry pattern matching algorithm that can scan the existence of a query string among multiple test strings looking at each character exactly once, making it one of the main options for software-base intrusion detection systems such as SNORT. We present the Split-AC algorithm, which is a reconfigurable variation of the AC algorithm that exploits domain-specific characteristics of Intrusion Detection to reduce considerably the FSM memory requirements. SplitAC achieves an overall reduction between 28-75% compared to the best proposed implementation.

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