Force Installation Code on adding remote radio modules


I’ve been thinking about playing with XBees as part of a sensor network. Reading up on the subject, I found this article ( In my understanding, it seems, the sensor network can be compromised if adding remote radio modules without using installation codes since the initiation of communication with new modules is using a default fallback key. I’m not sure if I understand this right, but wouldn’t you want to enforce queuing of the installation code of the device?

Thanks in advance,