private static int DecryptRoomsCountFull()
 {
     try
     {
         string   lengthString = GetKeyValue("Vlera2");
         string   keyFull      = GetKeyValue(path, name);
         int      length       = Convert.ToInt32(lengthString);
         Encoding ascii        = Encoding.ASCII;
         int      nr;
         // Bejme deshifrimin e numrit te dhomave qe jane ne program
         string nrDhomash        = keyFull.Substring(keyFull.Length - length, length);
         string nrDhomashDec     = "";
         Byte[] encodedRoomCount = ascii.GetBytes(nrDhomash);
         foreach (Byte b in encodedRoomCount)
         {
             nr = Algebra.GetIndex(Convert.ToChar(b));
             // Bejme kete veprim: ((nr + 6) / 8) - 9
             nr            = Algebra.Substract(Algebra.Divide(Algebra.Sum(nr, 6, 59), 8, 59), 9, 59);
             nrDhomashDec += Algebra.GetChar(nr).ToString();
         }
         return(Convert.ToInt32(nrDhomashDec));
     }
     catch
     {
         return(0);
     }
 }
        /// <summary>
        /// Ben deshifrimin e numrit serial qe eshte i ruajtur ne rregjistra nga versioni i plote ne
        /// versionin DEMO
        /// </summary>
        /// <returns>numrin serial te deshifruar</returns>
        private static string DecryptKeyFull()
        {
            try
            {
                int      length  = Convert.ToInt32(GetKeyValue("Vlera2"));
                string   keyFull = GetKeyValue(path, name);
                Encoding ascii   = Encoding.ASCII;
                int      nr;
                // Bejme deshifrimin e numrit te dhomave qe jane ne program
                string nrDhomash        = keyFull.Substring(keyFull.Length - length, length);
                string nrDhomashDec     = "";
                Byte[] encodedRoomCount = ascii.GetBytes(nrDhomash);
                foreach (Byte b in encodedRoomCount)
                {
                    nr = Algebra.GetIndex(Convert.ToChar(b));
                    // Bejme kete veprim: ((nr + 6) / 8) - 9
                    nr            = Algebra.Substract(Algebra.Divide(Algebra.Sum(nr, 6, 59), 8, 59), 9, 59);
                    nrDhomashDec += Algebra.GetChar(nr).ToString();
                }

                // Bejme deshifrimin e kohes se ngarkimit te sistemit
                string loadedSystemTime = keyFull.Substring(keyFull.Length - (4 + length), 4);
                string systemTimeDec    = "";
                Byte[] systemTime       = ascii.GetBytes(loadedSystemTime);
                foreach (Byte b in systemTime)
                {
                    nr = Algebra.GetIndex(Convert.ToChar(b));
                    // Bejme kete veprim: ((nr + 8) / 3) - 15
                    nr             = Algebra.Substract(Algebra.Divide(Algebra.Sum(nr, 6, 59), 3, 59), 15, 59);
                    systemTimeDec += Algebra.GetChar(nr).ToString();
                }

                // Bejme deshifrimin e numrit serial te sistemit
                string systemSerial        = keyFull.Substring(0, 10);
                string systemSerialDec     = "";
                Byte[] encodedSystemSerial = ascii.GetBytes(systemSerial);
                foreach (Byte b in encodedSystemSerial)
                {
                    nr = Algebra.GetIndex(Convert.ToChar(b));
                    // Bejme kete veprim: ((nr - 7) / 10) + 2
                    nr = Algebra.Sum(Algebra.Divide(Algebra.Substract(nr, 7, 59), 10, 59), 2, 59);
                    systemSerialDec += Algebra.GetChar(nr).ToString();
                }

                // Bejme deshifrimin e numrit serial te hard diskut
                string hardDiskSerial    = keyFull.Substring(10, keyFull.Length - (4 + length + 10));
                string hardDiskSerialDec = "";
                Byte[] encodedHDSerial   = ascii.GetBytes(hardDiskSerial);
                int    i = 0;
                foreach (Byte b in encodedHDSerial)
                {
                    nr = Algebra.GetIndex(Convert.ToChar(b));
                    // Bejme kete veprim: ((nr - ((i * 3) + 3) / 7) - 6
                    nr = Algebra.Substract(Algebra.Divide(Algebra.Substract(nr,
                                                                            Algebra.Sum(Algebra.Multiply(i, 3, 59), 3, 59), 59), 7, 59), 6, 59);
                    hardDiskSerialDec += Algebra.GetChar(nr).ToString();
                    i++;
                }
                int numerDhomash = Convert.ToInt32(nrDhomashDec);
                numerDhomash = (numerDhomash + 4) * 3;
                // Tani bashkojme vlerat e gjetura nga deshifrimet e mesiperme dhe e kthejme kete vlere
                return(systemSerialDec + hardDiskSerialDec + systemTimeDec + "-" + numerDhomash.ToString());
            }
            catch (Exception ex)
            {
                return("");
            }
        }