Шифрование RSA и 3DES

using System;
using System.Collections.Generic;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks;
 
namespace ConsoleApp1
{
    class Program
    {
       
        static void Main(string[] args)
        {
            RSAParameters privateKey;
            RSAParameters publicKey;
 
            RSACryptoServiceProvider RSA = new RSACryptoServiceProvider();
            privateKey = RSA.ExportParameters(true);
            publicKey = RSA.ExportParameters(false);
 
            UnicodeEncoding byteConverter = new UnicodeEncoding();
            string toEncrypt = "Hello, world";
 
            Console.WriteLine($"To encode: {toEncrypt}");
 
            byte[] encBytes = RSAEncrypt(byteConverter.GetBytes(toEncrypt), publicKey, false);
 
            string encrypt = byteConverter.GetString(encBytes);
            Console.WriteLine("Encrypt str: " + encrypt);
            Console.WriteLine("Encrypt bytes: " + string.Join(", ", encBytes));
 
            byte[] decBytes = RSADecrypt(encBytes, privateKey, false);
 
            Console.WriteLine("Decrypt str: " + byteConverter.GetString(decBytes));
            Console.WriteLine("Decrypt bytes: " + string.Join(", ", byteConverter.GetBytes(encrypt)));
 
            Console.ReadKey();
        }
    }
}

static class Extensions
{
    public static void GenerateKeyAndIV(this SymmetricAlgorithm alg, string password)
    {
        int seed = 17;
        foreach (var b in Encoding.UTF8.GetBytes(password))
        {
            seed = seed * 486187759 + b;
        }
        
        Random rnd = new Random(seed);
        byte[] salt = new byte[11];
        rnd.NextBytes(salt);
        
        using (var deriveBytes = new Rfc2898DeriveBytes(password, salt, 5000))
        {
            alg.Key = deriveBytes.GetBytes(alg.KeySize/8);
            alg.IV = deriveBytes.GetBytes(alg.BlockSize/8);
        }
    }
}

using (var tripleDes = new TripleDESCryptoServiceProvider())
{
    string password = "the_secr3t";
    tripleDes.GenerateKeyAndIV(password);
    // ...
}