When you run the installation script, you specify the communication security configuration for the Provisioning Service. You can update the configuration later if you want to change the communication security configuration.
Note that all components should use the same communication security configuration. In other words, if you use SSL for the Provisioning Service, you should also be using SSL for Endeca Service and Studio. If you choose to implement unsecured communication for the Provisioning Service, you should also implement unsecured communication for Endeca Server and Studio as well.