using System;

using System.Security.Cryptography;

using System.Text;

using System.IO;

public class Program

{

    public static void Main()

    {

        string  _keyPublic = "2487fae9",

                value = "NStbdb6LM1JIV8d0Ok3UEQ==";

        DESCryptoServiceProvider des = new System.Security.Cryptography.DESCryptoServiceProvider();

​

        byte[] bytesKey = Encoding.UTF8.GetBytes(_keyPublic);

​

        Array.Resize(ref bytesKey, des.Key.Length);

        Array.Resize(ref bytesKey, des.IV.Length);

​

        des.Key = bytesKey;

        des.IV = bytesKey;

​

        byte[] bytesIn = Convert.FromBase64String(value);

​

        MemoryStream msIn = new MemoryStream(bytesIn);

        ICryptoTransform desdecrypt = des.CreateDecryptor();

​

        CryptoStream cryptStreem = new CryptoStream(msIn, desdecrypt, CryptoStreamMode.Read);

​

        StreamReader srOut = new System.IO.StreamReader(cryptStreem, System.Text.Encoding.UTF8);

        string result = srOut.ReadToEnd();

​

        srOut.Close();

        cryptStreem.Close();

        msIn.Close();

        Console.WriteLine (result);

    }

}