Friday, February 12, 2010

European credit and debit card security broken

Seems like the problem with this system is that the problem is that the PIN is stored on the chip... and that's just as stupid as writing it on the card! The attacks are simple... either a card that always agrees the PIN given is correct, or a terminal that tries to authenticate all 10000 PINS and then learns the right one.

Payment processors have for years been wanting to have an offline secure system, but it just doesn't work. With cheap enough data systems available everywhere, it's not hard for every Wal-Mart most rural gas stations to see a satellite. Get a $20/mo. dial-up account if you have to... there's no reason for anything that does money to be off the grid.

If the PIN is stored online like traditional ATM cards, then there would be a quick way to be sure there's honest checking of the pin and alarms if somebody fails too many times. The American "contact" systems are actually reasons to not require a signature or a PIN... but those are also designed for small-dollar transactions and keeping the fast food line moving. Sure, they're open to cloning risk, but they're willing to take that downside because there's enough upside to using the system.

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