I'm working on a medical enterprise application and was wondering if users can confidently print documents containing PHI via AirPrint without any major security risks. Obviously the local network they're operating on should be configured with the highest level of security. I couldn't find any technical details regarding the security of the AirPrint protocol and was hoping someone could provide some additional information on the AirPrint protocol.
I think you'll find the information you want here:
Deploying AirPrint in Enterprise
In particular in the transcript you'll see that AirPrint will use TLS if the printer supports it.