Breach of Credit Card Security?

4.2 million credit card numbers have apparently recently been stolen by hackers. Now, even more credit users may have been compromised hundreds of millions. St. Louis-based Heartland Payment announced yesterday that hackers gained access to the machines it uses to process roughly 100 million credit card transactions every month. The company has no idea how long its systems were being monitored, saying only that it was "longer than weeks." Given the sheer volume of cards that are processed, this is believed to be the largest data breach in history. Watch your cards closely for unauthorized charges!