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My wife had her wallet stolen in Florence while we were traveling. It turned out that some banks will give different numbers to each card and other banks (Ban
by jdeibele 10y ago
My wife had her wallet stolen in Florence while we were traveling. It turned out that some banks will give different numbers to each card and other banks (Bank of America) will give the same number.
We had to cancel the BofA card that I had.
Fortunately our CapitalOne card used different numbers and we were able to keep traveling without a lot of hassle. For our next trip, we're going to make sure there's no number overlap.
- AnimalMuppet 10y agoThere's card numbers, and then there's card numbers. That is: My wife and I have cards that have the same number on the front. On the back, though, the three-digit... I forget what it's called, but there's this additional number that is not embossed into the face of the card. Her card has a different one of those than mine does. And the bank can tell the difference, can tell which card made the purchase, and can shut down one but not the other. So it doesn't matter if the two cards share the same main number, as long as the bank can tell them apart. Does BofA give different three-digit extra numbers to their cards? Do they give the same extra numbers? Do they give extra numbers at all?
- uiri 10y agoThe numbers on the back - the CVV code - is essentially a cryptographic hash of the information on the front of the card: expiration date, name, card number, whatever else is on there. So each physical card should have a different CVV if the card number is the same. Given 3-4 digits and millions of issued cards, there will of course be collisions among cards with different numbers. I think every card issued by Visa, Mastercard and American Express (at the very least) in the US has these extra numbers.