OK, to do something entirely crazy.... My garage door is computer controllable (X10). What I want to do is a secure "auto open". That is, when the empeg (with the wireless interface) comes within range of my base station, the garage door opens.

Ideas for the easiest way to do it (with a fair level of security)?
Just pinging the empeg isn't secure enough. But maybe SSH is the way to go...

As an added bonus, I suppose I can have the system close the garage doors when the empeg dissappears (car shut down). Hmm... On second thought - I probably want to leave the empeg on to sync overnight, any ideas for how to signal "car has been shut off" over the net?