Slideshow: 15 worst data breaches
TJX
Impact: 94 million credit cards exposed. According to KNOS Project cofounder and chief architect Kevin McAleavey, this was possible because TJX's network wasn't protected by any firewalls. Albert Gonzalez, hacking legend and ringleader of the Heartland breach, was convicted and sentenced to 40 years in prison, while 11 others were arrested.
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