Quote:
Originally Posted by twins
I'm not an expert on the security CC companies use, but it doesn't seem too difficult to imagine they would have a way of tagging the cards with tracking data each time you swipe it so that if the magnetic strip is copied, they could track it. The company knew exactly when the cards were copied. I pictured a server swiping the card on their own device and then using the restaurants swiper.. They copy the magnetic strip, make new cards from blanks and then sell them all over the world. Make them all summer.
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When you swipe your card, that is a completely passive action. Standard card readers do not have any ability to write data back to the card. Additionally the cards don't really have a lot of storage room for additional things like when/where the card was used.
There is no practical way to know when or if card data has been copied. All you can do is correlate fraudulent charges after the fact back to one or more merchants that the affected cards had in common.