Affine Cipher

Challenge Overview

Create an implementation of the Affine cipher, an ancient encryption algorithm from the Middle East.

Visit the affine-cipher exercise on Exercism to read the full instructions and download the exercise files.

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Solution 1 by @ChrisPritchard (⭐ 0) — View on Exercism
Solution 2 by @ErikSchierboom (⭐ 1) — View on Exercism
Solution 3 by @Maxim66 (⭐ 0) — View on Exercism

Source: Exercism csharp/affine-cipher

💡 View Solution

using System;

public static class AffineCipher
{
    const int m = 26;

    public static string Encode(string plainText, int a, int b)
    {
        if(!AreCoPrime(a, m))
            throw new ArgumentException();