Unauthorized information detection system and unauthorized attack source search system
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United States of America Patent
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Sep 13, 2011
Grant Date -
Jan 17, 2008
app pub date -
Feb 2, 2005
filing date -
Feb 2, 2004
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Abstract
A system for detecting and tracing a (D)DoS attack and identifying the attack source, which system simplifies the judgment reference to determine whether a (D)DoS attack is present. The number of source addresses of the packets transmitted via the Internet line is monitored. When the number of the source addresses has reached a predetermined number or a predetermined ratio within a predetermined time, it is judged that an unauthorized attack is present. Moreover, where the hop number of the packet is different from a hop number corresponding to the transmission source information, the packet is judged to be malicious.
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