Some embodiments include a computer server. The computer server can be configured to: add a security system associated with a user account; provision one or more communication devices associated with the security system; configure a cryptographic key to associate at least a communication device amongst the communication devices with the security system; configure an access control file that is cryptographically signed by the computer server and encrypted with the cryptographic key associated with the security system, wherein the access control file contains permissions of the communication devices to the security system; and provide a data payload including the access control file to a first communication device of the communication devices.