How can I encrypt my print jobs?

Many printers, especially those used in businesses, support IPP over HTTPS. If you have access to the printer's control panel, you can enable HTTPS and install a certificate that you trust. On your computer, set up a printer manually and specify https://printer-domain or printer-domain:443 as the printer's address, depending on what operating system you are using.

You can usually find documentation for your specific printer model about how to enable HTTPS.