Philip Chee wrote:
On Sun, 19 Dec 2010 08:44:27 -0500, Rick Merrill wrote:
I have found each web site uses different FIELD names for credit cards.
SM 2 allows named fields to be purged upon exit, but it is NOT automatic.
I don't see how s/w could tell the difference ;-) between a credit card number
and a
USPS/UPS/FEDX tracking number (-:
<http://en.wikipedia.org/wiki/Luhn_algorithm>
You detect any 15/16 digit number that uses a cyclic redundancy check
(weren't you lecturing Callek on CRCs earlier?) based on the Luhn
algorithm. If you do it right you can also catch (and not save) Social
Security numbers and other sensitive information.
Phil
You may be able to do CRC in your head, but I do not seem to be able to do it!-)
Callek said "Cycle..." so I looked it up thinking it might be a new term, but it was
not. So I hope he & you didn't REally think I was "lecturing."
I'm willing to bet that thousands of people do not realize that SM has retained the
types of information it keeps under "forms" but are actually "fields."
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