Mitigating denial-of-service attacks using frequency domain...

Details Mitigating denial-of-service attacks using frequency domain... Mitigating denial-of-service attacks using frequency domain...

2007-03-13

2007-03-13

Pham, Chi (Department: 2616)

Multiplex communications

Data flow congestion prevention or control

Control of data admission to the network

C370S230100, C370S235000, C726S023000

Reexamination Certificate

active

10224506

ABSTRACT:
Methods and apparatus for mitigating denial of service attacks in a communications network are described. Frequency domain techniques such as Fourier Transform are used to detect packet flooding in which a frequency spectrum reveals a periodic pattern to the attack packets. A pulse generator is used to create pulses having the frequency and phase of the periodic pattern. New packets arriving simultaneously with the created pulses are dropped from the system and packets which are not synchronized with the pulse generator are passed through the system normally.

REFERENCES:
patent: 2002/0083175 (2002-06-01), Afek et al.
“Analysis of a Denial of Service Attack on TCP”, Schuba et al., Coast Laboratory, Purdue University, 1997 IEEE, pp. 208-223.

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