Tarkistusnumeroiden
Tarkistusnumeroiden, known in English as check digits or check numbers, are a simple form of error detection used in identification numbers such as barcodes, credit card numbers, and ISBNs. They are a single digit or a few digits appended to a string of digits. Their purpose is to help detect accidental errors during manual data entry or transmission.
The check digit is calculated from the other digits in the number using a specific algorithm. When
Various algorithms are used to calculate check digits, with the most common being the Luhn algorithm, used