SCARBOROUGH, Maine — Hannaford Bros. here said last week that it was investing “millions” of dollars in upgraded security in the wake of the data breach that exposed 4.2 million credit and debit card numbers to potential theft. In a conference call to update the media on the chain's efforts, Hannaford executives said the company has installed a security monitoring service from IBM and is rolling out new PIN pads that will encrypt card numbers before they are transmitted. The numbers will ...

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