[natch]

If use BitTorrent Sync, does that mean all your data is sitting unencrypted at the remote location? I guess that would be one reason.

[rich90usa]

The "encryption secret" was implemented in version 1.2 of BitTorrent Sync: http://www.bittorrent.com/sync/developers/api - but for now you'll need an API key to generate them.

Alternatively, you could roll your own solution on top of Sync by encrypting your files on your own and creating a Sync folder of the encrypted files.