The 10 Biggest Security Stories Of 2011

In May, hackers broke into CitiGroup online banking system and stole personal data from more than 200,000 credit-card customers, or roughly 1 percent of the bank's 21 million customers in North America, which is here the hack occurred. The thieves took customer names, account numbers and email addresses, but failed to abscond with social security numbers, card expiration dates and CVV codes, all of which would have made the stolen information even more useful. Nevertheless, security experts said what was stolen could give hackers enough fodder to trick people into revealing more info through phishing scams. The break-in sparked increased scrutiny from federal regulators concerned whether current requirements were enough to protect bank customers.

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