I am unsure if anyone replied to you. Let me know if you still want to discuss.
Fundamentally, I was aware of only 2 wireless printers a couple of years ago that had onboard encryption/decryption.
So if you had a capture tool like a NetScout/VeEX/Ekahau or a jerried-up laptop, you could view the cleartext transfers between the wireless printer and the other wireless communicating device.
Using the VeEX product, I was able to show that the wireless printer was receiving a Photoshop image from a laptop in the nurse's work area; even had the name of the file.
I don't know of any un-resolved questions I had about this thread.
But, do you have any ?
Just about every barcode, receipt, or Wi-Fi card printer I know of has had some kind of encryption for the last 10- 14 years. There is just too much competition at the Enterprise level for there not to be. Most of them, like everything else, supported WEP encryption early on, but eventually they went to WPA-2 - which requires more CPU horsepower for the encryption, if nothing else.
It's amazing how very little CPU horsepower is required if all you are doing is printing. Although many now support 802.11ac with 40 MHz wide single-stream radios, barcode and receipt printers print just as fast at the 802.11b 2 Mbps rate. It isn't until you get into color id printers that less than 54 Mbps makes a difference.
Any modern printer is going to be WFA certified, or at least built with a WFA equivalent radio so they will have WPA2 - a stupid idea IMHO, but some very small manufacturers don't want to pay the for WFA membership, and each one of their current certifications requires WPA2, and MFP. = > $
I know most SOHO desktop printers use /b/g/ rates as the speeds possible from /n/ac are wasted on the majority of print jobs. Because, like I said previously, a printers speed limitations are due to PHYSICAL print speed limitations, not low communications rates.
Some of Zebras printers support over 30 combinations of wireless authentication, encryption, RADIUS, and DHCP option processing processing. I have also worked on several other manufacturer printers, and some of these have horrible configuration controls - but in a SOHO environment the scalability is not usually required.