As someone who has actually done this before, it's pretty easy. PNG has R,G,B, and A. So you can effectively get 4 bits per pixel on Least Significant Bit Subs

As someone who has actually done this before, it's pretty easy. PNG has R,G,B, and A. So you can effectively get 4 bits per pixel on Least Significant Bit Substitution. You can fit a lot of data into image, whether plain text or binary, depends solely how you encode the data. If you use a complex picture its basically impossible to detect visually, even if you enhance the lsb's. What works pretty well for detection is doing chi square analysis, but even then, if you fill the rest of the bits with random data, that method fall short. I don't really see how this is an effective means of transferring and/or sending torrents. The .torrent isn't illegal or something to worry about, its downloading the files it points to that "sometimes" is. Cool project, but serves no real purpose.