Generate Passphrases in C# (.NET)

using System;
using System.Security.Cryptography;
using System.Linq;

public class PassphraseGenerator
{
    private static readonly string[] Wordlist = new[]
    {
        "ability", "able", "about", "above", "accept" // ... 7771 more words
    };

    public static string GeneratePassphrase(int wordCount = 6)
    {
        using var rng = RandomNumberGenerator.Create();
        var words = new string[wordCount];

        for (int i = 0; i < wordCount; i++)
        {
            byte[] randomBytes = new byte[4];
            rng.GetBytes(randomBytes);
            uint randomValue = BitConverter.ToUInt32(randomBytes, 0);
            int index = (int)(randomValue % Wordlist.Length);
            words[i] = Wordlist[index];
        }

        return string.Join("-", words);
    }

    public static void Main()
    {
        // Generate 6-word passphrase
        string passphrase = GeneratePassphrase(6);
        Console.WriteLine(passphrase);
        // Output: "thunder-crystal-freedom-mountain-quantum-brilliant"

        // Calculate entropy: log2(7776^6) ≈ 77.5 bits
        double entropy = wordCount * Math.Log(Wordlist.Length, 2);
        Console.WriteLine($"Entropy: {entropy:F1} bits");
    }
}