[Cryptography] Photojournalists & filmmakers want cameras, to be encrypted

[grarpamp]

On Tue, Dec 27, 2016 at 12:35 PM, Phillip Hallam-Baker
<phill at hallambaker.com> wrote:
> Most pro DSLRs have some sort of image authentication built in.
> None that have been examined have turned out to be competent.
> The tell is usually the need to buy special apparatus to verify the signatures.
> That means they are doing some sort of idiot HMAC scheme with a shared key across every device.

Links to source docs?