p5-Algorithm-LUHN

Calculate the Modulus 10 Double Add Double checksum

This module calculates the Modulus 10 Double Add Double checksum, also known as the LUHN Formula. This algorithm is used to verify credit card numbers and Standard & Poor's security identifiers such as CUSIP and CSIN. You can find plenty of information about the algorithm by searching the web for "modulus 10 double add double".