SCARBOROUGH, Maine — Hannaford Bros. here said yesterday 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 immediately. The numbers will remain encrypted ...

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