Obfuscating Form Template Data using custom IMasterForm - Making saved template files illegible

      private const int KEY_SCRAMBLE = 42;
      // Read the fields of this master form
      public FormPages ReadFields()
      {
         if (!File.Exists(_path + ".txt"))
         {
            return null;
         }

         string text = File.ReadAllText(_path + ".txt");
         byte[] array = Convert.FromBase64String(text);
         MemoryStream ms = new MemoryStream(array);
         _processingEngine.LoadFields(ms);


         //to create new forms pages
         FormProcessingEngine tempProcessingEngine = new FormProcessingEngine();
         FormPages formFields = tempProcessingEngine.Pages;
         formFields.AddRange(_processingEngine.Pages);
         return formFields;
      }
      
      // Update the fields of this master form
      public void WriteFields(FormPages fields)
      {
         MemoryStream ms = new MemoryStream();

         if(fields == null)
            throw new ArgumentNullException("fields");
         _processingEngine.Pages.Clear();
         _processingEngine.Pages.AddRange(fields);
         _processingEngine.SaveFields(ms);

         string text = Convert.ToBase64String(ms.ToArray());

         File.WriteAllText(_path + ".txt", text);
      }

      // Read the form (RasterImage) attached to this master form (optional, might return null)
      public RasterImage ReadForm()
      {
         if(!File.Exists(_path + ".tif"))
            return null;

         RasterImage image = _repository.RasterCodecsInstance.Load(_path + ".tif", 1, CodecsLoadByteOrder.Bgr, 1, -1);

         ImageProcessing.ScrambleCommand sc = new ImageProcessing.ScrambleCommand();
         sc.Rectangle = new LeadRect(0, 0, image.Width, image.Height);

         sc.Key = KEY_SCRAMBLE;
         sc.Flags = ImageProcessing.ScrambleCommandFlags.Decrypt;

         sc.Run(image);

         return image;
      }

      // Update the form (RasterImage) attached to this master form
      public void WriteForm(RasterImage form)
      {
         if(form == null)
            throw new ArgumentNullException("form");
         form.DitheringMethod = RasterDitheringMethod.None;

         ImageProcessing.ScrambleCommand sc = new ImageProcessing.ScrambleCommand();
         sc.Rectangle = new LeadRect(0, 0, form.Width, form.Height);

         sc.Key = KEY_SCRAMBLE;
         sc.Flags = ImageProcessing.ScrambleCommandFlags.Encrypt;

         sc.Run(form);

         _repository.RasterCodecsInstance.Save(form, _path + ".tif", RasterImageFormat.Tif, 1, 1, -1, 1, CodecsSavePageMode.Overwrite);
      }