Re^10: Faster Luhn Check Digit Calculation?

in reply to Re^9: Faster Luhn Check Digit Calculation?
in thread Faster Luhn Check Digit Calculation?

Algorithm::LUHN supports some odd inputs

That module may attempt to extend the purpose and use of the algorithm to inputs for which it was never designed; but in doing so, it invalidates itself and the algorithm.

Ie. The purpose of the algorithm is to catch 2 digit transposition errors in numeric identifiers; trying to extend that mathematics to non-numerics invalidates that purpose.

Eg. The use of Mod 9, on alpha data that has a 26 character alphabet means that some (34% of) combinations of 2-digits transpositions will not be detected.

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Comment on Re^10: Faster Luhn Check Digit Calculation?

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Re^11: Faster Luhn Check Digit Calculation? by kschwab (Vicar) on Dec 02, 2018 at 23:02 UTC
The module docs read like Standard & Poor's decided to do that, not the original module author, but I digress.	[reply]

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