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Wouldn't the Luhn algorithm checksum [1] limit the available digits? It is specifically there so a one-off error doesn't result in a charge going to a valid ot
by r00fus 6y ago
Wouldn't the Luhn algorithm checksum [1] limit the available digits? It is specifically there so a one-off error doesn't result in a charge going to a valid other account.
[1] https://en.wikipedia.org/wiki/Luhn_algorithm https://en.wikipedia.org/wiki/Luhn_algorithm
- senkora 6y agoI believe that’s what they mean by “check digit”.
- contravariant 6y agoMost checksum algorithms that I know of for credit card numbers only decrease the number of available digits by 1. Or equivalently it increases the length by the length of the checksum (usually 1 for credit cards) and doesn't otherwise affect the available numbers.
- bausano_michael 6y agoGreat video on checksum was done by Ben Eater: https://youtu.be/ppU41c15Xho https://youtu.be/ppU41c15Xho