Target told the Associated Press on Friday that debit-card PIN numbers were among the financial information stolen from millions of customers who shopped at the retailer earlier this month.
The company said the stolen personal identification numbers, which customers type in to keypads to make secure transactions, were encrypted and that this strongly reduces risk to customers. In addition to the encrypted PINs, customer names, credit and debit card numbers, card expiration dates and the embedded code on the magnetic strip on back of the cards were stolen from about 40 million credit and debit cards used at Target between Nov. 27 and Dec. 15.
Security experts say it’s the second-largest theft of card accounts in U.S. history, surpassed only by a scam that began in 2005 involving retailer TJX Cos.
Target said it doesn’t have access to nor does it store the encryption key within its system, and the PIN information can only be decrypted when it is received by the retailer’s external, independent payment processor.
The company maintains that the “key” necessary to decrypt that data never existed within Target’s system and could not have been taken during the hack.
However, Gartner security analyst Avivah Litan told the Associated Press that the PINs for the affected cards are not safe and people “should change them at this point.”
Minneapolis-based Target said it is still in the early stages of investigating the breach. It has been working with the Secret Service and the Department of Justice.
Information from The Associated Press contributed to this report.