Transcript for New Warning From the FBI: You Will Be Hacked
This one from the FBI tonight. You will be hacked, they say, it's not a matter of if, but when. And now, word it may have happened yet again. This time, at the office supply giant staples. So, what can you do to protect yourself? ABC's chief business correspondent Rebecca Jarvis tonight. Reporter: Tonight, the secret service confirming to ABC news it is assisting staples, investigating a possible breach into customer credit card data. More Americans, potentially in the line of fire. Have you had your credit card stolen? Yes. It was $15,000 worth of credit cards that were opened in my name. This is the new reality. This is a cold war. Reporter: Robert her Ja Vick is an internet security expert and "Shark tank" shark. Founded one of the world's preeminent cyber security firms. Reporter: He says the thiefs have the upper hand. This is only going to get worse, more dangerous and we have to be more vigilant. Reporter: K-mart, dairy queen, Home Depot, target and more. 500 million financial records stolen in just the past year. And experts say to protect yourself, you must monitor those bills regularly, even though, David, just 1 in 10 of us actually do. All right, help from one of the sharks tonight. We'll take it.
This transcript has been automatically generated and may not be 100% accurate.