I've recently come across the problem of having to share several large files with multiple individuals (data collected from experiments, nothing shady). Distribution through torrent seems the best way, especially since several computers are rather close (on a university network) and can download quickly and then pool upload bandwidth for people outside the network.
However, placing these files on a public tracker is not preferable. Are there any (preferably free) trackers that allow registering a torrent, but not making it public? It doesn't need to be super secure.Behavior like youtube or google docs, where those with a link can easily access the torrent, but those without it will have no way of finding it would be enough.
I would prefer not to host my own tracker service on a server (university is a little sketchy around torrents - even legitimate ones).