Abstract:Abstract. An intrusion detection system (IDS) usually has to analyse Giga-bytes of audit information. In the case of anomaly IDS, the information is used to build a user profile characterising normal behaviour. Whereas for misuse IDSs, it is used to test against known attacks. Probabilistic methods, e.g. hidden Markov models, have proved to be suitable to profile formation but are prohibitively expensive. To bring these methods into practise, this paper aims to reduce the audit information by folding up subseq… Show more
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