Reinhold Grether on 22 May 2001 11:31:58 -0000


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[rohrpost] Worldwide Denial-of-Service Activity


David Moore, Geoffrey M. Voelker and Stefan Savage
Inferring Internet Denial-of-Service Activity
<http://www.caida.org/outreach/papers/backscatter/index.xml>

"In this paper, we seek to answer a simple question: "How
prevalent are denial-of-service attacks in the Internet today?".
Our motivation is to understand quantitatively the nature of
the current threat as well as to enable longer-term analyses
of trends and recurring patterns of attacks. We present a
new technique, called "backscatter analysis", that provides
an estimate of worldwide denial-of-service activity. We use
this approach on three week-long datasets to assess the number,
duration and focus of attacks, and to characterize their behavior.
During this period, we observe more than 12,000 attacks
against more than 5,000 distinct targets, ranging from well
known e-commerce companies such as Amazon and Hotmail
to small foreign ISPs and dial-up connections. We believe
that our work is the only publically available data quantifying
denial-of-service activity in the Internet."




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