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To identify abnormal traffic such as P2P flows, DDoS attacks, and Internet worms, this paper discusses a circuit design to realize real-time abnormal traffic detection in broadband networks. Real-time counting of cardinality is the key feature of the circuit. Although our previous study showed that cardinality counting is effective for detecting various types of abnormal traffic, the slowness of DRAM access prevented us from deploying cardinality counting in backbone networks. To address thedoi:10.2197/ipsjjip.26.590 fatcat:vzf7kbxx3fgztju22enmcvsblu