[Cryptography] Facebook -> SteganographyBook

Jerry Leichter leichter at lrw.com
Tue Jan 27 19:19:55 EST 2015

On Jan 27, 2015, at 6:33 PM, grarpamp <grarpamp at 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

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