Re: Shouldn't be hard for Nikon to do
You either don't understand the issue, or are missing the point. The police have had a habbit of seizing photo-journalist's equipment under spurious reasons in order to identify suspects
And in dodgey regimes they'll kick the living shit out of you to get your crypto key. Your best bet is to have a device that enables you to backup your images from your fast camera card to multiple encrypted more easily concealed but slower to access micro-SD cards when you are unable to upload. In-camera encryption only works in nicer policed parts of the World (that don't have reveal your keys laws). Wrong solution to the problem.