geeks.com site compromised

I use DiscoverCard "one-time" numbers for my web purchases. It's my understanding (someone correct me if I'm wrong) that if this informaiton got in the hands of another vendor their "vendor code" would not match up with the one-time number and they would be unable to charge to the card (i.e. the one-time number is tied to that particular vendor code only).
 
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