METHODS AND SYSTEM FOR SIMULTANEOUS MULTIPLE RULES CHECKING

A method and system for checking data against a plurality of rules simultaneously. A data string having keywords in the data string is received. All of the keywords in the data string are simultaneously examined against rule keywords using for example, a finite state machine constructed by the Aho-Corasick algorithm. The rule keyword represents at least one rule of the plurality of rules. It is determined which of the plurality of rules are satisfied by the data string based on whether each keyword matches the rule keywords. Such rules may be used for application such as negative security policies.