Flow aggregation or time synchronization ensures low-rate denial of service (LDoS) attack flows form an ideal rectangular pulse at the victim to maximize attack efficiency. The differences of end-to-end delay between each host are critical for aggregation or synchronization. A new approach based on Euclidean distance is proposed to avoid the complexity of direct measuring internet end-to-end delay. Using NS2 experiments, the performances of such coordinated attack are shown and compared with

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... oordinated attack. Test results prove that an aggregated or synchronous LDoS attack launched by the approach is even more detrimental.