Content Syndication using Feeds. How do I make it secure?

I am taking a look at using feeds to push content from one site to another.
Reading the pages for Feeds Atom, Views Atom, and Push_Hub it looks like push hub will notify if someting changes on the host server.

I was wondering how I make the feed only available to another machine of my choosing and not allow it to be world readable?

Services allows for key authentication.

Does feeds module have a similar option?