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Destranix
3 months ago

You go through the text letter for letter.
Each letter is converted into a number (a=0,…z=25).
You add to the number the displacement value of the chiffre.
You calculate the rest of the number when divided by 26. (referred to as “mod” or “modulo”.) As a result, you make sure that the numbers that are larger than 26 after the addition start again at 0.
Finally, you turn the number back into a letter.