?

Log in

No account? Create an account
CVV2 Questions - brad's life — LiveJournal [entries|archive|friends|userinfo]
Brad Fitzpatrick

[ website | bradfitz.com ]
[ userinfo | livejournal userinfo ]
[ archive | journal archive ]

CVV2 Questions [Nov. 25th, 2003|11:30 am]
Brad Fitzpatrick
The Internet is useless. I want to know why CVV2 codes on credit cards are supposed to be more secure and help consumers. Every website just tells me, "It protects you". But why?

Theories:

1) it's not embossed, so employee crooks at stores swiping cards with carbon paper don't get the CVV2 number.

2) it's not part of the hashing function within the card's primary 16 numbers, so even if you use a credit card generator program (trivial to write), you can't get correct CVV2 numbers, since only the card issuer has it.

3) merchants aren't supposed to store CVV2 numbers? So if their databases are hacked, nobody gets those? No... because I know Amazon and many others do.

I don't really think (1) and (2) happen much anymore compared to databases being hacked (3), and since everybody just puts CVV2 numbers in their databases, how does CVV2 really help?

Enlighten me!
LinkReply

Comments:
[User Picture]From: mge
2003-11-25 01:36 pm (UTC)

Regarding #2

American Express has something similar to the CVV2 (if not the same thing) and I recall one of their programers telling me that a long time ago there was a deterministic alogorithm that would take a CC # and give you the coresponding CVV2. Then they realized that was a bad idea. Now the numbers are not tied to the card at all.
(Reply) (Thread)