using System;

using System.Security.Cryptography;

using System.Text;

using System.IO;

​

public class Program

{

    public static void Main()

    {

            Encoding nEncoding=Encoding.Default;

​

​

            String nValue = "7J9+9gtBboOWVYUnaGCIplHjS1n6NnxFU1nv3BQdNuk=";

                                String nPassword="444444";

                                MD5CryptoServiceProvider xHash = new MD5CryptoServiceProvider();

            byte[] xHashP = xHash.ComputeHash(nEncoding.GetBytes(nPassword));

            TripleDESCryptoServiceProvider xDes = new TripleDESCryptoServiceProvider

            {

                Key = xHashP,

                Mode = CipherMode.ECB

            };

            byte[] xBuff = Convert.FromBase64String(nValue);

            string xVal = nEncoding.GetString(xDes.CreateDecryptor().TransformFinalBlock(xBuff, 0, xBuff.Length));

            xBuff = null; xDes = null; xHashP = null; xHash = null;

Console.WriteLine(xVal);

            }

}