Not sure if this is the right site to ask this, but here it goes:

Let's say I'd like to share a couple of private files with a few friends. The size of these are quite large, so I've figured the best route to distribute these is via torrent.

So, on my home PC I create a torrent and start seeding and announce to a public tracker like openbittorrent and publicbt.

Now, both of those are public trackers, but they don't seem to have anyway of searching through what is actually being tracked.

If I'm only passing around the torrent file to a few friends, whats the chances that someone else will 'randomly' come across the torrent via the public tracker and start leeching?