Test encrypt 3, C#

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;
using System.Security.Cryptography;
using System.Text;

public static class StringUtil
{
    private static byte[] key = new byte[8] {1, 3, 0, 7, 2, 0, 1, 8};
    private static byte[] iv = new byte[8] {0, 6, 0, 8, 2, 0, 1, 8}; // trouve les bons chiffres en t'inspirant de key

public static string Crypt(this string text)
    {
        SymmetricAlgorithm algorithm = DES.Create();
        ICryptoTransform transform = algorithm.CreateEncryptor(key, iv);
        byte[] inputbuffer = Encoding.Unicode.GetBytes(text);
        byte[] outputBuffer = transform.TransformFinalBlock(inputbuffer, 0, inputbuffer.Length);
        return Convert.ToBase64String(outputBuffer);
    }

public static string Decrypt(this string text)
    {
        SymmetricAlgorithm algorithm = DES.Create();
        ICryptoTransform transform = algorithm.CreateDecryptor(key, iv);
        byte[] inputbuffer = Convert.FromBase64String(text);
        byte[] outputBuffer = transform.TransformFinalBlock(inputbuffer, 0, inputbuffer.Length);
        return Encoding.Unicode.GetString(outputBuffer);
    }
}

namespace Rextester
{
    public class Program
    {
        
 
        public static void Main(string[] args)
        {
            string expected = "Bravo message décodé";
            string a = expected.Crypt();
            Console.WriteLine(a);
            
            string actual = "Rg+1+L55elU2xBYdvQZFhAlypLh4UWTfL2cBjwezztmkO5DZy+aZTLoEJH0xvb6d";
            Console.WriteLine(actual.Decrypt());            
        }
    }
}

Show compiler warnings [ + ] Show input
Compilation time: 0,17 sec, absolute running time: 0,09 sec, cpu time: 0,08 sec, average memory usage: 14 Mb, average nr of threads: 3