|No such thing as a small change|
Re^10: Faster Luhn Check Digit Calculation?by BrowserUk (Patriarch)
|on Dec 02, 2018 at 22:51 UTC||Need Help??|
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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