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Mitigating denial-of-service attacks using frequency domain techniques

  • US 20040037326A1
  • Filed: 08/21/2002
  • Published: 02/26/2004
  • Est. Priority Date: 08/21/2002
  • Status: Active Grant
First Claim
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1. A method of mitigating a packet flooding attack on a system in a communications network, the method comprising the steps of:

  • a) producing, responsive to packets of a packet flooding attack arriving at the system at a detectable frequency, a pulsed signal of that frequency;

    b) aligning the phase of the pulsed signal with the arrival of the packets of the packet flooding attack; and

    c) dropping, from the system, packets that arrive during pulses of the pulsed signal.

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