At the moment I have three umbraco websites that each have their own content trees, but all have one page in common. At the moment, since all three sites are independent, the data is just copied into each site.

However our client is now asking that all the pages can be managed from one site. Ie. the data is updated in one umbraco installation and somehow mirrored across the other sites. Bear in mind this page is password protected and contains sensitive data.

How can I achieve this?

My first thought was maybe to expose an xml feed that contained all of the relevant data however I have no idea how I'd keep all the data secure. Would it be a case of encrypting and setting over https? I literally have no idea where to begin here.. can anyone point me in the correct direction?

I'm really looking for the simplest solution here.

Thanks