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Are able to use the debit cards online without the p.i.n. the only thing you need is the code, the cvv code to commit fraud using the cards as long as the debit card allows you to use it as a point of sale card as well. >> you have quite a resume. you have a 100% track record for being able to break into any corporate system for which you have been paid to hack. what is your advice? what advice would you give to target to protect themselves against future hackings? >> target, obviously, they had a huge security issue. they were compromised. we don't know how the hackers got in. obviously, targ...

>> we switch gears. the massive theft of credit and debit card theft at tar gat in recent weeks has highlighted the threat of credit card fraud but how do hackers actually make use of the data that they steal? here's laurie segall. >> hey, rosa. we want to take a look at what it reveals. take a look at what we've found. if you've done some holiday shopping 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, your credit card number, the card's skpir yags d...

Step. >> i'm curious. you guys there at total defense are probably looking at this and scratching your heads. do we have any idea how this happened? >> you know, it's interesting. i think ultimately the right authority, the secret service and target and some of their consultants are looking into it right now. i think it will be some time before we truly know how it happened. the really surprising thing here is that the cvv code, which is the three-digit code on the back of the credit card, was compromised. tens of millions of cvv codes compromi compromised. cvv codes should be encrypted at all...

The credit card breech. that's what i said to you. the breech may not affect the credit cards used at target, but is your information vulnerable? can the thieves open other accounts in your name with the information they got? >> from what my research has shown, it was the actual credit card numbers. it was not your personal information. it was not your address. it was not your cvv code. it was not your social security number and date of birth, et cetera. i do not see this as something where people are going to be able to go out and obtain -- and really do a lot of identity theft situation. i t...

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...