Distributed denial of service attacks have grown larger in scale, more sophisticated and harder to detect, according to three large technology vendors that have recently published analyses of attacks.

DDoS attacks, malicious streams of traffic that can take down a website and cause reputational and other damage to a company, were big news during the fall of 2012. A group called Izz ad-Din al-Qassam Cyber Fighters carried out a series of these attacks on U.S. banks' websites. Such exploits have not made the news much lately because few have been successful enough to bring down a bank's website for a noteworthy length of time.

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