I often print confidential documents over a large intranet to various printers based on where I am in the building. However, since the building is so large, it is highly likely there is a malicious device connected somewhere in the network, and I wish to reduce the risk of these private documents being intercepted by an attacker.
To prevent unsuspecting man-in-the-middle attacks across a large network, I would like to encrypt my print jobs as they travel across the network to the printer of my choice. The printers in question are already physically secure and kept in restricted areas.
Is there any secure protocol (SSL/TLS) I can use for sending print jobs to give me any protection at all? Would it be best to simply switch those secure printers to a different VLAN and then switch my device to the printers' VLAN when I must use them? Are there any printers at all that support secure printing?