SMTP proxy for masking credit card numbers

[Eric Shubert]

Just FYI, MOD10 is a check-digit algorithm, used for things besides CC 
numbers. It is useful for checking the validity of pretty much any 
numeric input. It grew out of the older days of data processing as a 
means of validating data entry (identifying keypunch errors). If any 
digit is mistyped or numbers are transposed, the check-digit will not 
match, making it easy to identify errors.

A side effect of having a check-digit is that if you have a credit card 
number with a missing digit, with a little careful math you can 
calculate the missing digit. I've done this in the past when a number 
didn't quite transfer on the old machines that took imprints. Some of 
you youngsters may know what I'm talking about. In that case, never mind. ;)

-- 
-Eric 'shubes'

On 01/28/2011 09:49 AM, Shawn Badger wrote:
> Found the script I was talking about earlier that does the MOD10 check
> on the number to see if is a credit card number or not.
>
> http://www.elifulkerson.com/projects/python-creditcard-mod10-check.php
>
>
>
>
> On Tue, Jan 25, 2011 at 3:29 PM, Hunter Kreie <hunter at brownies.com
> <mailto:hunter at brownies.com>> wrote:
>
>     I’m looking for a lightweight, open-source STMP proxy that I can use
>     to mask credit card numbers on inbound messages. This is
>     content-manipulation or content-scrubbing vs. content-filtering. I’m
>     sure this can be done with quite a few packages, but what’s your
>     recommendation?
>
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