Detection of denial-of-service attacks using frequency domain analysis

摘要

Methods and apparatus for detecting denial of service attacks on a system in a communications network are provided. A frequency analysis is performed on certain types of packets that arrive with a periodic nature. A frequency power spectrum obtained through Fourier Transform reveals whether the power level of any particular frequency is greater than the average power spectrum. The detection of a higher than average power level is an indication that an attack is in progress.