password generation based on https://www.eff.org/dice

PasswordGenerator.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Security.Cryptography;

namespace PasswordGenerator
{
    class Program
    {
        static void Main(string[] args)
        {
            var words = args.Length > 0 ? int.Parse(args[0]) : 5;
            var dict = GenerateDictionary();
            var password = string.Join(" ", GenerateRandomStrings().Take(words).Select(x => dict[x]));
            Console.WriteLine(password);
        }

        private static Dictionary<string,string> GenerateDictionary()
        {
            var url = "https://www.eff.org/files/2016/07/18/eff_large_wordlist.txt";
            WebClient client = new WebClient();
            return client.DownloadString(url)
                .Split('\n')
                .Where(line => !string.IsNullOrWhiteSpace(line))
                .Select(line => line.Split('\t'))
                .ToDictionary(x => x[0], x => x[1]);
        }

        public static IEnumerable<string> GenerateRandomStrings()
        {
            var rng = RandomNumberGenerator.Create();
            while (true)
            {
                var buffer = new byte[1];
                var password = new byte[5];
                for (var i = 0; i < 5; i++)
                {
                    rng.GetNonZeroBytes(buffer);
                    while ((buffer[0] < 1) || (buffer[0] > 6)) rng.GetNonZeroBytes(buffer);
                    password[i] = buffer[0];
                }

                yield return string.Join("", password.Select(x => x.ToString()));
            }
        }
    }
}