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  2. RPG400-L
  3. February 2004

Re: Modulus 10 formula

Bob,

>The biggest issue is a subtle one but it is as follows,

Also note the difference can appear to be subtle because it only affects values
where the total number of characters (including the check digit) is odd, and the
majority of credit card numbers have 16 digits so either formula works.

Some (old) VISAs have 13 digits, and AmEx has 15.  Some other lesser used cards
may have an odd number of characters too.  However, if you only used the Mod10
formula for the 16 digit VISA or MasterCard numbers in the past, you'd not
notice the difference until you hit a different credit card type.

Doug

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