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Decode? and are customers comforted by that? >> reporter: we're going to find out. for now the answer depends on who you ask. target is telling shoppers that that data is safe and secure, it's scrambled. it's encrypted at checkout and encrypted in the system and when it leaves the system. no reason to believe that data has been decrypted. but security experts say that certainly there will be attempts to do that. there will be programs in place that will try to decode that data. that's why some people may be concerned. >> the encryption itself is actually an industry grade standard, and they us...

Tell shoppers their information is still safe and secure, despite the fact those incrypted pin numbers were stolen as part of the massive data breach. the pin information was fully incrypted at the key pad, remained incrypted within the system and remained encrypted leaving our system. so a few layers of security there but security experts are telling us with hackers this sophisticated, there are still reasons for shoppers to be concerned. >> i know that i never use my debit card. i just use my credit card. what are experts suggesting for people concerned if perhaps their debit card informatio...

Protections in place so that when i use my card, i'm safe? >> well, just because you don't detect the attack doesn't mean you haven't been attacked. >> hmm. >> you know, it's -- what we tell all of our clients is, it's not a matter of if you'll be attacked, it's a matter of when. and it's just -- it's just the way that we deal with -- i know with target, some people are starting to say, well, these p.i.n. numbers had to have been decrypted, because our p.i.n. was actually compromised. however, there's a very good chance they could have been hit somewhere else. >> so then, david, really quickly...

Been compromised. but some cyber security experts say it might be possible. this morning, the investigation into the one of the largest data breaches in u.s. history is the deepening and customers remain nervous. >> it makes me leery about going there. >> at first target had said up to 40 million of its customers debit and credit card numbers had been stolen around the start of the holiday shopping season. know they confirm encrypted personal identification numbers were also taken in the massive security breach. but it says that hack teres can't crack the codes. we remain confident, target say...

Ugly on the campus of azra university in cairo. 60 students have been arrested. there's reports that one young protester died. if you did your christmas shopping at target this year, or went to target to buy anything, you might want to call the bank and change your debit card p.i.n. number. >> target is backtracking after telling shoppers that p.i.n. numbers weren't stolen during the massive security breach. cnn's alexandra field joins us live from new york. >> reporter: good morning, deb. target is saying this was a bigger breach than initially reported, along with the card numbers and name...