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Intrusion detection signature analysis using regular expressions and logical operators

  • US 6,487,666 B1
  • Filed: 01/15/1999
  • Issued: 11/26/2002
  • Est. Priority Date: 01/15/1999
  • Status: Expired due to Term
First Claim
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1. A packet-based method embodied in a computer-readable medium, of describing signatures used for detecting intrusion to a local network, comprising the steps of:

  • using a set of regular expression identifiers to represent a set of packet types;

    using logical operators to describe relationships between said packet types;

    combining said at least one of said identifiers and at least one of said logical operators to provide a regular expression describing each of said signatures; and

    using said regular expressions to provide an executable process.

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