The Luhn's algorithm, also known as the "modulus 10" or "mod 10" algorithm, is a simple checksum formula used to validate various identification numbers, such as credit card numbers. Developed by IBM scientist Hans Peter Luhn in 1954, the algorithm helps detect accidental errors in numbers. It works by doubling every second digit from the right, summing the digits of the products, and adding them to the undoubled digits. If the total modulo 10 is zero, the number is valid. While effective at catching common errors, it is not designed to protect against malicious attacks.
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January 2025
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