Enigme, C# - rextester

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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] {, , , , , , , }; // trouve les 8 bons chiffres en t'inspirant de key

// la chaine à décoder : "vwOYLLUqMsQsGFGAC0x/YQrXMt1AMnf33vv0jarDosL6sL6Xa766cQ/7BjEc34DYQza9EBNxtllaxgEDHKFCnRu7YS+il+Hor5gWT+AFH2uqnQzJICd8C7huSutOYUOk88MM4fU3En49jrjQozcW+Gf2e8rEKdyvNG+kkp0+58Ka52mhshumDyHZ+p8r27WtYQo9F3HpN3IvgZWFXas6k34HHt+MhfIekg5OKm5bi28pbfI6SY4CmA2aZhMTOEU8ESdFw7kxOtg="

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 actual = "ici la chaine a décoder";
            Console.WriteLine(actual.Decrypt());            
        }
    }
}

Show compiler warnings [ + ] Show input
Compilation time: 0,17 sec, absolute running time: 0,08 sec, cpu time: 0,08 sec, average memory usage: 13 Mb, average nr of threads: 3