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A novel detection scheme against DDoS attack is proposed from a distributed perspective. The distributed end-hosts in the Internet are organized into a P2P network by Chord protocol for detection. The detection algorithm based on CUSUM and space similarity is deployed at each node in the P2P detection network. The P2P-based detection network is adopted, which makes the scheme be able to scale to the situation with a large number of detection nodes. CUSUM-based detection at the end-host can detect the slight change at the host. Thus it implements the early detection against DDoS attack, and relieves the detection burden at the victim end.
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