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>> any sort of encryption can be broken. and, again, depending on what type of encryption they were using, is a lot harder to decrypt. but if your pin number's four digits, it's going to be easier to guess and figure out what that pin number can be. >> oh, my goodness. what should people do? what's your best recommendation? >> well, first, again, understand that target is -- is the one that we're hearing about today, but a lot of different merchants are having attacks they don't even know about. understand, this is the reality. make sure you're using credit cards and not debit cards. make sure you're not using your pin number. if possible, use something along the lines of a prepaid card or cash. something -- you're wanting to understand if your card is compromised that you can mitigate your damage. >> my goodness. well, a lot of folks are hearing