BitTorrent Bleep – P2P messaging solution from BitTorrent
blog.bittorrent.com
blog.bittorrent.com
Still waiting for anything that could help create a Bittorrent Sync-compatible app.
I'm not saying it doesn't work (to be fair I haven't tried it, but have only heard good things about it). It's just that it works in its own world.
..and it is the best solution for guaranteeing confidentiality and the encryption need/problem - not to need it, since there isn't a server to eavesdrop on