By Rebecca Sausner

Heartland Payment Systems may now hold the dubious distinction of "largest security breach ever" in the wake of a hack that may have been sniffing card numbers, expiration dates and track data off the processor's network from as early as May until last month. The number of cards compromised is still a matter of conjecture - the biggest guesstimate has been about 100 million, but Heartland CEO Robert Carr is scolding those who jump to that concusion.

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