Short: Checks validity of credit card numbers Author: Chris Wareham, Morphos port by Fabrizio "Lanch" Bartoloni Uploader: lanch tiscali it (Fabrizio Bartoloni) Type: util/misc Architecture: ppc-morphos Checks whether a string of digits is a valid credit card number according to the Luhn algorithm, a public domain algorithm invented by IBM scientist Hans Peter Luhn to validate credit card numbers.