nanog mailing list archives
Re: CVV numbers
From: Lynda <shrdlu () deaddrop org>
Date: Sat, 09 Jun 2012 07:14:42 -0700
On 6/9/2012 12:06 AM, Hal Murray wrote:
In response to my comment about:If I'm not supposed to not "tell anyone", why is it even printed where I can read it?(Sorry for the extra not in there.)
The CVV number is simply to prove that the card is in your possession. The percentage of the sale that goes to Amex/Visa/Mastercard/Discover (etc) is determined by whether the merchant can supply various items, and the CVV is one of them. Running the card physically (where the merchant touches your card, and presumably verifies that you are you) gets taxed the lowest. The CVV is just meant to replace that verification. Sort of. I disapprove *strongly* of any online merchant that does not request this simple item, but it's not magic.
I got an off list suggestion of: http://www.cvvnumber.com/ It looks reasonable. But then, whois for cvvnumber.com says:
Registrant: Domains By Proxy, LLC
Should I really take them seriously?
No. No you should not. Here's the canonical Wikipedia entry, for those still playing along.
http://en.wikipedia.org/wiki/Luhn_algorithmThere's a few more grown-up words there. The best part is that it's a public algorithm. What's not to like?
-- A picture is worth 10K words -- but only those to describe the picture. Hardly any sets of 10K words can be adequately described with pictures.
Current thread:
- CVV numbers Hal Murray (Jun 09)
- Re: CVV numbers Lynda (Jun 09)
- Re: CVV numbers Owen DeLong (Jun 09)
- Re: CVV numbers Alexandre Carmel-Veilleux (Jun 09)
- Re: CVV numbers Wayne E Bouchard (Jun 09)
- Re: CVV numbers Barry Shein (Jun 09)
- Re: CVV numbers John Adams (Jun 09)
- Re: CVV numbers Scott Howard (Jun 09)
- Re: CVV numbers Matthew Palmer (Jun 09)
- Re: CVV numbers Owen DeLong (Jun 09)
- Re: CVV numbers Lynda (Jun 09)
- Re: CVV numbers Jimmy Hess (Jun 09)
- Re: CVV numbers Scott Howard (Jun 09)
- Re: CVV numbers Aled Morris (Jun 09)