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A Novel Mechanism to Defend Against Low-Rate Denial-of-Service Attacks

  • Wei Wei
  • Yabo Dong
  • Dongming Lu
  • Guang Jin
  • Honglan Lao
Part of the Lecture Notes in Computer Science book series (LNCS, volume 3975)

Abstract

Low-rate TCP-targeted Denial-of-Service (DoS) attack (shrew) is a new kind of DoS attack which is based on TCP’s Retransmission Timeout (RTO) mechanism and can severely reduce the throughput of TCP traffic on victim. The paper proposes a novel mechanism which consists of effective detection and response methods. Through analyzing sampled attack traffic, we find that there is a stable difference between attack and legitimate traffic in frequency field, especially in low frequency. We use Sum of Low Frequency Power spectrum (SLFP) for detection. In our algorithm the destination IP address is used as flow label and SLFP is applied to every flow traversing edge router. If shrew is found, all flows to the destination are processed by Aggregated Flows Balance (AFB) at a proper upstream router. Simulation shows that attack traffics are restrained and TCP traffics can obtain enough bandwidth. The result indicates that our mechanism is effective and deployable.

Keywords

Round Trip Time Power Spectrum Density Traffic Class Edge Router Burst Length 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2006

Authors and Affiliations

  • Wei Wei
    • 1
  • Yabo Dong
    • 1
  • Dongming Lu
    • 1
  • Guang Jin
    • 1
    • 2
  • Honglan Lao
    • 3
  1. 1.College of Computer Science and TechnologyZhejiang UniversityHangzhouP.R. China
  2. 2.College of Information Science and EngineeringNingbo UniversityNingboP.R. China
  3. 3.Department of Electrical EngineeringUniversity of Southern CaliforniaLos AngelesUSA

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