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Biggest data breaches of all time

POSTED: 08:27 AM CST Dec 19, 2013    UPDATED: 09:47 AM CDT Sep 19, 2014 

Home Depot's massive data breach involving 56 million payment cards is among the biggest of all time.

Home Depot
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Ferre Dollar/CNN

Home Depot on Thursday announced that a data breach between April and September may have put an estimated 56 million payment cards from its U.S. and Canadian networks at risk. That would make it the largest compromise of debit and credit cards in the string of cyberattacks that have hit retailers over the past year. 

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