AmEx card numbers

American Express forum. Talk about AmEx credit cards like Blue, Gold, Platinum, Centurion, and more.
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AmEx card numbers

Postby TXviking » Tue Aug 23, 2016 12:36 pm

I have a particular American Express card that I've had for a long time. For reasons involving shady merchants, I've twice asked American Express to reissue the card with a new number.

However, the new number is predictable from the old number (it's generated from the original number using a very obvious algorithm.) The new expiration date is predictable based on when the request for a reissue was made. Only the four-digit CVV2 code (or whatever AmEx calls it) isn't obviously predictable, and even that is showing some patterns making me think it's not completely random.

Doesn't this defeat the whole purpose of getting a new credit card number?

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Re: AmEx card numbers

Postby takeshi » Fri Aug 26, 2016 8:34 am

Not necessarily. A person looking to commit fraud isn't going to know when you made the request for replacement. if an algorithm can be cracked then, yes, it won't offer much benefit but the CVV2 exists to help mitigate.

Security is always about layering and making it more difficult. The only way to fully secure anything is to make it so unusable that it would defeat the purpose of the item in question. It's a balancing act and an arms race.

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