Котфускация исполняемого .net кода

using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Linq;

class Program
{
    static void Main(string[] args)
    {
        var orig = File.ReadAllBytes("9c63b8a4e0f74341b6484d481d434a02.png");
        var modified = Modify(orig);
        Console.WriteLine("Packed sizes: original = {0}, modified = {1}", orig.Length, modified.Length);

        Compare(orig, modified);

        orig = Unpack(orig);
        modified = Unpack(modified);
        Console.WriteLine("Unpacked sizes: original = {0}, modified = {1}", orig.Length, modified.Length);

        Compare(orig, modified);

        if (Enumerable.SequenceEqual(orig, modified))
            Console.WriteLine("Unpacked data is equal");
        else
            Console.WriteLine("Unpacked data not equal");
    }

    private static byte[] Modify(byte[] orig)
    {
        var ms = new MemoryStream();
        using (var image = Image.FromStream(new MemoryStream(orig)))
            image.Save(ms, ImageFormat.Png);
        /*using (var bmp = new Bitmap(image.Width, image.Height, PixelFormat.Format32bppArgb))
        {
            using (Graphics gr = Graphics.FromImage(bmp))
                gr.DrawImage(image, new Rectangle(0, 0, image.Width, image.Height));
            bmp.Save(ms, ImageFormat.Png);
        }*/
        return ms.GetBuffer();
    }

    private static byte[] Unpack(byte[] orig)
    {
        var ms = new MemoryStream();
        using (var image = Image.FromStream(new MemoryStream(orig)))
            image.Save(ms, ImageFormat.Bmp);
        return ms.GetBuffer();
    }

    private static void Compare(byte[] orig, byte[] modified)
    {
        using (var img1 = (Bitmap)Image.FromStream(new MemoryStream(orig)))
        using (var img2 = (Bitmap)Image.FromStream(new MemoryStream(modified)))
        {
            int h = img1.Height, w = img1.Width;
            if (h != img2.Height || w != img2.Width)
            {
                Console.WriteLine("Image sizes is different");
                return;
            }

            for (int x = 0; x<w; x++)
                for (int y=0; y<h; y++)
                    if (img1.GetPixel(x, y) != img2.GetPixel(x, y))
                    {
                        Console.WriteLine("\tat ({0},{1}): {2:x8} != {3:x8}", x, y, img1.GetPixel(x, y), img2.GetPixel(x, y));
                        return;
                    }
        }

        Console.WriteLine("Images are equal");
    }
}