After credit card hacks, it's tough to get customers' new credit card numbers.

Target lost tens of millions of dollars after a security breach.

American banks and retailers are still using the same old magnetic strip cards, instead of more secure chip and pin cards commonly used abroad.

Millions of Americans have had credit card and debit card information stolen by hackers at big retailers like Target and Neiman Marcus. Marketplace Money host Carmen Wong Ulrich talks to consumer advocate Bob Sullivan about what we can do to keep our money safe.

Target's CEO advises victims of the credit hack to "be cautious about sharing personal information."