This sounds like a great unmet opportunity to create a camera for journalists that encrypts every picture to a public key that only your editor (presumably in a safe location) has the private key to decrypt.
The main problem with adding encryption would be that photos and video can consume a lot of bandwidth, and the bandwidth inside a digital camera is limited, as is the processing power. It would make more sense to put the encryption directly on the media card, similar to the fashion in which Eye-fi cards include a tiny CPU and web server to automatically offload the content to a trusted network.
I'm just worried that could confuse the camera, though: image preview wouldn't work, checksumming wouldn't work...