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Luhn' s Algorithm

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

Introduction

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.

Definition

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.

License

This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

A list of licenses authors might use can be found here

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About the Author

wapnethr

Austria Austria
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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) Pinmemberkirkaiya6-Aug-09 19:42 
QuestionIncorrect Algorithm? PinmemberPeebles3-Mar-05 3:36 
Generaluse this code... PinmemberJoel Thoms18-Jan-05 12:47 
I ended up using this code instead. Very clean and functional.
 
http://www.codeproject.com/aspnet/creditcardvalidator.asp[^]
 
Joel Thoms
http://joel.net
Questionhow to use PinmemberJoel Thoms18-Jan-05 12:41 
Generalwrote an implementation myslef some time ago Pinmember
MadHatter ¢
9-Dec-04 8:02 
GeneralExplaining my vote PinmemberJason De Arte8-Dec-04 9:45 

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