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 while on the company’s network. Ron Hodge, chief executive officer, said Hannaford would be using “military- and industrial-strength security going forward,” including new systems to prevent “malware” installation, updated firewalls and intrusion protections systems, and the rollout of an ISO 27001 Information Security Management System. Asked to be more specific about the cost of the upgrades, Hannaford said it would be “millions” of dollars, but “not tens of millions.”

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