There are some dashcams that have passwords. My old VisionDrive needed a PW to use the viewer. Maybe it had a somewhat proprietary encoding scheme? But the problem was that there was a config file that stored the PW in the clear. Don’t know if the files actually were encrypted though…
ISTR that some others had a one touch erase feature. But I’m sure it didn’t securely erase things.
Another useful feature for either a dashcam or regular video camera would be a Truecrypt-like set of dummy videos, either stored in the clear and/or with a different password.
But yeah, if you don’t worry about decryption on the camera, then you could just store the public key on the camera/card and not have to worry about entering the private key. The great part is that the camera operator doesn’t even need to know anything- they get an SD card with the public key from their employer, shoot pictures and video, and send the files back, never having access to any of the unencrypted video.
One problem would be to properly tag the files so the user knows what to send back. They probably don’t want the files with timestamps in the clear, so they’ll need their own mnemonic to organize the files. Either that or they’d have to either send the whole SD card back or upload even the unimportant footage.
