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Credit card had been used. investigators say prosecutors at this point have not confirmed whether the card was actually used in mexico. those reports raised concerns that his disappearance could somehow be connected to his coverage of opec, the organization of the pa troul yum exporting countries. >> that didn't scum from us. so i don't know where that information came from. and that doesn't make sense. he went for a walk. and that was all we know. we have no idea. >> reporter: bird's sister-in-law said the family still doesn't have any answers for a disappearance is that makes no sense. and b...

Personal information is they know more about us, so they have an easy way to target us and to sell us things. >> i look at this in the context of this target hack that we've been talking about. and neiman marcus. and now possible involvement with the russian mob. >> right. >> and so if they get that information -- and that was just credit card data. >> right. >> but all of this personal information, there's got to be some potential for them to take more from us if they get the information from these companies? >> absolutely. and our credit card data says a lot about us. if you go through someo...

Shopping at target, you may be wondering what a hacker could learn from you from your credit card. when you swipe, this is what a hacker could learn from the data on the magnetic strip. your name, credit card number, the expiration date and the cvv code on the back. >> all of this key data can be used to falsify the card and fraudulently use it online. they can access that by the strip. >> reporter: in the case of the target hack, that data may be enough to make a counterfeit card. one security researcher showed us a different credit card hack explains. to the employee, everything looks normal...

At target -- you might be wondering what a hacker could learn about you from your credit card. when you swipe, here's what a hacker could learn from the data in that magnetic strip. your name, credit card number. the card's explanati expiratione number on the back. >> all could be used to frach lently use it online. access that by taking just by what's on the strip. >> in the case of the target hack, that data may have been enough to hackers to make a counter ffeit card. to the employee, everything looks normal. >> i just have to log in. i could make a selection here. and then i can do a credi...

Click pay. >> reporter: for the customer, standard. >> you move on. >> reporter: but for the hacker. >> i have access to the entire man strip data on this device and i can get all of this and enough information to actually create a whole different card. >> reporter: the target hack has some saying the u.s. is a little behind the times in terms of secure payments. >> one more secure solution in europe now, a chip and pin system in which the card doesn't actually have a strip. it has a chip within it. every time you use it, you also have to use a pin. >> reporter: according to the federal reserv...