Security breach at TJX believed to be biggest ever
For at least 17 months, someone had free rein inside TJX Cos.' computers. Without anyone noticing, one or more intruders installed code on the discount retailer's systems to methodically unearth, collect and transmit account data from at least 45.7 million credit and debit cards.
It's believed to be the biggest such breach of customer records ever in the United States - a theft that owes its size in part to the time the electronic heist went undetected, information security experts say.
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