Luhn Algorithm: [updated]

The , also known as the modulus 10 or mod 10 algorithm, is a simple checksum formula used to validate a wide variety of identification numbers. Developed by IBM scientist Hans Peter Luhn in 1954, this formula serves as the primary safeguard for digital checkout systems, verifying account numbers instantly before a transaction is ever sent over the network. It distinguishes a valid sequence of numbers from mistyped or scrambled digits to eliminate human error at the point of data entry. Core Mechanics & Use Cases

It is widely integrated across global digital infrastructure: luhn algorithm

The algorithm does not exist to secure data cryptographically, nor does it prevent malicious attacks. Instead, it protects businesses and consumers from simple keystroke errors and adjacent digit transpositions. The , also known as the modulus 10