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Posted 8 Dec 2004

Luhn' s Algorithm

, 8 Dec 2004
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Calculating checksum number using Luhn's algorithm


This sample implements the functionality of generating checksum number using Luhn's algorithm.

I've created a class LuhnAlgorithm with a static function:

public static int GetLuhnAlgorithmNumber(string data);

Return value is the generated number.


The Luhn algorithm or Luhn formula, also known as the "modulus 10" or "mod 10" algorithm, was developed in the 1960s as a method of validating identification numbers. It is a simple checksum formula used to validate a variety of account numbers, such as credit card numbers and Canadian Social Insurance Numbers. Much of its notoriety comes from credit card companies' adoption of it shortly after its creation in the late 1960s by IBM scientist Hans Peter Luhn (1896–1964).

Explanation of the Luhn's algorithm can be found here.


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Comments and Discussions

GeneralActually, this method only needs one line changed to compute the correct Luhn check-digit (the "return" equation is wrong) Pin
kirkaiya6-Aug-09 19:42
memberkirkaiya6-Aug-09 19:42 
QuestionIncorrect Algorithm? Pin
Peebles3-Mar-05 3:36
memberPeebles3-Mar-05 3:36 
Generaluse this code... Pin
Joel Thoms18-Jan-05 12:47
memberJoel Thoms18-Jan-05 12:47 
Questionhow to use Pin
Joel Thoms18-Jan-05 12:41
memberJoel Thoms18-Jan-05 12:41 
Generalwrote an implementation myslef some time ago Pin
MadHatter ¢9-Dec-04 8:02
MadHatter ¢
9-Dec-04 8:02 
GeneralExplaining my vote Pin
Jason De Arte8-Dec-04 9:45
memberJason De Arte8-Dec-04 9:45 

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