using System;

using System.IO;

using System.Text;

using System.Security.Cryptography;

public class Program

{

    public static void Main()

    {

        Console.WriteLine(Decrypt("Ua3LyPFM175GN8D3+tqwLA=="));     

        Console.WriteLine(Decrypt("k+iUoOvQYG98PuhhRC7/rg=="));

​

    }

        public static string Decrypt(string cryptedString)

        {

            string result;

            try

            {

                if (string.IsNullOrEmpty(cryptedString))

                {

                    result = string.Empty;

                }

                else

                {

                    DESCryptoServiceProvider descryptoServiceProvider = new DESCryptoServiceProvider();

                    result = new StreamReader(new CryptoStream(new MemoryStream(Convert.FromBase64String(cryptedString)), descryptoServiceProvider.CreateDecryptor(_rgbKey, _rgbIV), CryptoStreamMode.Read)).ReadToEnd();

                }

            }

            catch (Exception)

            {

                result = string.Empty;

            }

            return result;

        }

​

        private static byte[] _rgbKey = Encoding.ASCII.GetBytes("7ly6UznJ");

​

        private static byte[] _rgbIV = Encoding.ASCII.GetBytes("XuVUm5fR");

}