One of the biggest distributed denial of service (DDoS) attacksever recorded hit CloudFlare's data centers in Europeon Monday, according to Tech Week Europe.

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Few details about the attack have emerged, but CloudFlare CEOMatthew Prince posted on Twitter that it wasprobably close to 400Gbps in power, as it continues to investigate.The firm revealed the previous No. 1 DDoS attack last year,measuring in at just over 300Gbps, targeted at anti-spam outfitSpamhaus.

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Prince declined to disclose the name of the CloudFlare customerbeing targeted. However, several outlets, including Forbes and Reuters report that Bitcoin was the target ofthe attacks.

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The attackers used an increasingly common technique amongstDDoSers, which involves exploiting the UDP-based Network TimingProtocol. That protocol is normally used to sync clocks onmachines, but attackers have discovered they can exploit a weaknessthat allows them to query an NTP server about connected clients andtheir traffic counts.

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More on DDoS: Prolexic Technolgies reveals top 10 DDos Attack Trends

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