At this time, encryption is a very new feature in Zabbix. While it has been developed and tested extremely carefully and pedantically, it is likely to receive further improvements. Make sure to read through the official documentation on encryption for more details and in case changes are made. Right now, let's touch on basic concerns and features that are missing.
So far in this chapter, we've covered Zabbix server, agents, zabbix_get, and zabbix_sender—what about Zabbix proxies? Zabbix proxies fully support encryption. Configuration on the proxy side is very similar to agent configuration, and configuration in the frontend side is done in a similar way to agent encryption configuration, too. Keep in mind that all involved components must be compiled with TLS support—any proxies you have might have to be recompiled. When considering encryption, think about the areas where it's needed most—maybe you have the Zabbix server and proxy communicating over the Internet...