Spotlight: The year's biggest data breaches

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It's been a rough year for data security, and that's putting it as mildly as we possibly can. Hackers of all varieties have been relentless, and their methods have become more insidious than ever. The number of breaches recorded annually is soaring, but experts say this number likely reflects a small fraction of the total breaches committed--most of which remain undisclosed. Start the slideshow...