Z-Wave is considered to be one of the most secure home automation protocols currently available. This is due to the encryption algorithms and the secured communication between the Z-Wave devices and home automation server.
Primarily, the security comes from the security layer of Z-Wave transmitters that includes the MAC address and encrypts the transmitted data. Additionally, when pairing a device the wireless protocol has a specific syncing procedure where an encrypted network key is shared between devices and is required for the server-to-device communication.
The Agile Home Automation system uses Homeseer technologies. This system is a closed system behind your router’s firewall with built-in hack blocking. It uses a complex userid and password combination and establishes encrypted wireless connectivity with all of your Z-Wave devices. This system has been developed over the last 20 years and has very strong security measures built into the software.