Using 20th century cards against 21st century hackers made Target an easy target.
The U.S. is the juiciest target for hackers hunting credit card information. And experts say incidents like the recent data theft at Target's stores will get worse before they get better.
That's in part because U.S. credit and debit cards rely on an easy-to-copy magnetic strip on the back of the card, which stores account information using the same technology as cassette tapes.
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