Method and apparatus for defending distributed denial-of-service (DDoS) attack through abnormally terminated session
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United States of America Patent
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Feb 24, 2015
Grant Date -
Mar 21, 2013
app pub date -
Sep 12, 2012
filing date -
Sep 16, 2011
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Abstract
There are provided a method and apparatus for defending a Distributed Denial-of-Service (DDoS) attack through abnormally terminated sessions. The DDoS attack defending apparatus includes: a session tracing unit configured to parse collected packets, to extract header information from the collected packets, to trace one or more abnormally terminated sessions corresponding to one of pre-defined abnormally terminated session cases, based on the header information, and then to count the number of the abnormally terminated sessions; and an attack detector configured to compare the number of the abnormally terminated sessions to a predetermined threshold value, and to determine whether a DDoS attack has occurred, according to the results of the comparison. Therefore, it is possible to significantly reduce a false-positive rate of detection of a DDoS attack and the amount of computation for detection of a DDoS attack.
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