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Abstract

Analysis of security attacks shows that an attack leaves its imprint or signature in the attack packets. Traffic from Distributed Denial of Service attacks and rapid worm spreads has the potential to yield signatures. While all signatures may not be indicative of attacks, it is useful to extract non-transient signatures that are carried by a sufficient number of flows/packets/bytes. The number of packets/bytes in the flows carrying the signature may be used for rate-limiting the flows, providing for timely and automated response to both known and unknown attacks. This paper proposes an efficient algorithm, PISA, which clusters flows based on similarity in packet information and extracts signatures from high-bandwidth clusters. Extensive experiments on two weeks of real attack data of 100 million packets yield about 1744 signatures. Additionally, PISA extracted the signature for the Blaster worm connection attempts in a mix of traffic from a trans-Pacific backbone link.

Keywords

Signatures Traffic Clusters Security DDoS Worms 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2005

Authors and Affiliations

  • Parminder Chhabra
    • 1
  • Ajita John
    • 2
  • Huzur Saran
    • 3
  1. 1.Winlab, RutgersThe State University of New JerseyUSA
  2. 2.Avaya Labs ResearchLincroftUSA
  3. 3.Dept. of CS & EngIndian Institute of TechnologyNew DelhiIndia

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