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Luhn's algorithm, named for this algorithm Hans Peter Luhn, who developed it. This algorithm, based on the established 1950s, is not really new.
In everyday life, the numbers of credit cards we use in the physical environment, or online, are not arbitrarily determined. Card numbers are specified in a specific standard frame. Here we call this standard the luhn algorithm.
Luhn's algorithm working principle is as follows;
Take our sample card number 4242-4242-4242-4242.
We will perform our control in 3 steps.
The figures in the double digit are collected.
For 2,2,2,2,2,2,2,2
2 + 2 + 2 + 2 + 2 + 2 + 2 + 2 = 16
We multiply the numbers in a single dummy by 2 and add up the digits.
For 4,4,4,4,4,4,4,4
4 x 2 = 8 & gt; 8 4 x 2 = 8 & gt; 8 4 x 2 = 8 & gt; 8 4 x 2 = 8 & gt; 8 4 x 2 = 8 & gt; 8 4 x 2 = 8 & gt; 8 4 x 2 = 8 & gt; 8 4 x 2 = 8 & gt; 8
In this example, we take only 8 because the result is a single digit.
8 + 8 + 8 + 8 + 8 + 8 + 8 + 8 = 64
We sum up the two total results. If the result is exactly the 10th, in other words if mod10 is zero, we can say that the credit card number is valid.
16 + 64 = 80 (the card number is valid since 10 is the full rank). thanks