intellihouse is a smart-home-solution based on an openHAB-server and many distributed Raspberry-Pi-nodes controlling the actual hardware.
The idea is to put one (or more) Raspberry-Pi in every room and connect the hardware to its GPIO pins. Such a node is then fully functional, even if the openHAB server is offline (e.g. for maintenance or due to a hardware crash). So, if there are local sensors inside the room (e.g. an ordinary key button or a passive infrared sensor), the room's hardware can be used without any openHAB-interaction.
Every node (both Raspberry Pis and openHAB-server) has its own OpenPGP-key-pair. All communication is encrypted and signed using OpenPGP!
intellihouse is thus one of the most secure smart-home-solutions available!
Read more in the Wiki.