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http://krebsonsecurity.com/2014/09/home-depot-56m-cards-impacted-malware-contained/

Home Depot: 56M Cards Impacted, Malware Contained — Krebs on Security Home Depot said today that cyber criminals armed with custom-built malware stole an estimated 56 million debit and credit card numbers from its customers between April and September 2014. That disclosure officially makes the incident the largest retail card breach on record.