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Enhanced Correlation in an Intrusion Detection Process

  • Salem Benferhat
  • Fabien Autrel
  • Frédéric Cuppens
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 2776)

Abstract

Generally, the intruder must perform several actions, organized in an intrusion scenario, to achieve his or her malicious objective. Actions are represented by their pre and post conditions, which are a set of logical predicates or negations of predicates. Pre conditions of an action correspond to conditions the system’s state must satisfy to perform the action. Post conditions correspond to the effects of executing the action on the system’s state.

When an intruder begins his intrusion, we can deduce, from the alerts generated by IDSs, several possible scenarios, by correlating attacks, that leads to multiple intrusion objectives. However, with no further analysis, we are not able to decide which are the most plausible ones among those possible scenarios. We propose in this paper to define an order over the possible scenarios by weighting the correlation relations between successive attacks composing the scenarios. These weights reflect to what level executing some actions are necessary to execute some action B. We will see that to be satisfactory, the comparison operator between two scenarios must satisfy some properties.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2003

Authors and Affiliations

  • Salem Benferhat
    • 1
  • Fabien Autrel
    • 2
  • Frédéric Cuppens
    • 3
  1. 1.CRIL CNRS Université d’ArtoisLens CedexFrance
  2. 2.ONERA-CERTToulouse CedexFrance
  3. 3.IRITToulouse CedexFrance

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