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>> it's called data encryption data which allows it to be protected. but the problem with the pin numbers, there's only about four characters. which means there's only about 10,000 different combinations to do. altogether, it's not going to hold up because they can do brute forcing it to grab those pin numbers itself. >> initially target had said that card numbers and names were stolen. they are now saying the pin data was also stolen. the bottom line for anyone out there who was affected by this, they're being advised to get new pin numbers, it's the best thing to protect yourself moving forward, fred. >> thanks so much. let's bring in an expert on hacking. joining me now via skype. he's the founder of parameter securities. so david, target says pins are strongly encrypted. but can anything be decoded?