The 10 Biggest Security Stories Of 2011

In March, email marketing firm Epsilon Data Management disclosed that hackers had penetrated corporate databases and stole e-mail addresses of roughly 2 percent of its 2,500 customers. A division of Alliance Data Systems, Epsilon had many high-profile customers, including Best Buy, Citibank, J.P. Morgan Chase, TiVo and the Walt Disney Co. A total of 50 companies were affected by the breach, which occurred via a spear phishing campaign. While personal data was not stolen, Epsilon warned customers that the booty could be used to create fraudulent email in an attempt to get people to open malware-carrying attachments. CyberFactors, a risk and analytics firm, estimated the breach would cost Epsilon as much as $225 million in liabilities and $45 million in lost sales.

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