[prev in list] [next in list] [prev in thread] [next in thread] 

List:       cryptography
Subject:    Re: [Cryptography] Facebook -> SteganographyBook
From:       Jerry Leichter <leichter () lrw ! com>
Date:       2015-01-28 0:19:55
Message-ID: 1DE94317-B1A0-44C7-9B6F-BBF5712E8E2D () lrw ! com
[Download RAW message or body]

On Jan 27, 2015, at 6:33 PM, grarpamp <grarpamp@gmail.com> wrote:
> > Facebook fiddles with images to optimize their storage and display.
> > They hide or scrub EXIF information as well.  This must be
> > a very clever trick to pack a payload into an image on FB.
> Good point. Many services do this. So classical steg of
> invisibly embedding binary in image wouldn't work there. In
> that case examine how much visible resolution is preserved
> and available to you after such fiddling and overlay your data
> within that, ie a QR code transparency mask.
There's tons of existing work on embedding invisible watermarks in images in ways \
that survive some fairly nasty conversions.  It would be really nice to apply work \
intended to support DRM to providing security....

                                                        -- Jerry


_______________________________________________
The cryptography mailing list
cryptography@metzdowd.com
http://www.metzdowd.com/mailman/listinfo/cryptography


[prev in list] [next in list] [prev in thread] [next in thread]