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Slideshow: 15 worst data breaches

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VeriSign

Impact: Undisclosed information stolen. Security experts are unanimous in saying that the most troubling thing about the VeriSign breach, or breaches, in which hackers gained access to privileged systems and information, is the way the company handled it -- poorly. VeriSign never announced the attacks. The incidents did not become public until 2011, through a new SEC-mandated filing.

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Slideshow: 15 worst data breaches

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