Efficient Distributed Signature Analysis

Abstract. Intrusion Detection Systems (IDS) have proven as valuable measure to cope reactively with attacks in the Internet. The growing complexity of ITsystems, however, increases rapidly the audit data volumes and the size of the signature bases. This forces IDS to drop audit data in high load situations thus offering attackers chances to act undetected. To tackle this issue we propose an efficient and adaptive analysis approach for multi-step signatures that is based on a dynamic distribution of analyses. We propose different optimization strategies for an efficient analysis distribution. The strengths and weaknesses of each strategy are evaluated based on a prototype implementation.