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A unique ID does nothing to make a card / chip impossible / expensive to duplicate. Case in point: Your credit card number is unique

Perhaps I failed to make myself clear. I didn't claim it was difficult to duplicate because it's unique.

It's difficult to duplicate because the chip itself cannot be easily duplicated.

With credit card readers that focus only on the magnetic strip, anyone with a card reader/writer could copy the magnetic strip from one card to another, creating a perfect duplicate.

There have been attacks on card readers, tricking the reader into subsequently accepting fake cards.

But so far as I know, no attacker has managed to create a chip-intact clone of an EMV credit card.

In every country that has rolled out this system, fraud has dropped dramatically, as the bad guys shift their attention to low-hanging fruit — countries that haven't yet implemented EMV cards. I suspect that's a big reason why credit card fraud is increasing in the US.

http://en.wikipedia.org/wiki/EMV#Successful_attacks
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