[mhd]

Bring along your own keyboard? A good Model M doubles as weapon and/or body armor for the enterprising agent.

On a more serious note, while it's probably a bit harder to "infect" a system with, you probably can hook something up to the USB circuitry, in which case this wouldn't help.

Unless you continue the one-upmanship and have your HID transmissions encrypted on the hardware side, then it's just semi-random garbage for any logger. A software driver in the distro then makes it usable.

Something like that might even exist, for paranoid bluetooth users...

Edit: Silly me, bluetooth does feature encryption, of course. Not sure how strong/well implemented that is in the case of most keyboards.