Image based steganography that survives resizing?

[irongeek at irongeek.com (Adrian Crenshaw)]

Bar codes could work, but I want only the computer to see the stego, not a
human. If I use a barcode, won't it show to the user?

Thanks,
Adrian

On Wed, Jan 27, 2010 at 10:47 AM, Rob Fuller <jd.mubix at gmail.com> wrote:

> Agreed about the EXIF data, but are you only talking about binary
> steganography? You can hide barcodes in images pretty simply that
> would survive resizing just fine. Also, are you talking human or
> computer legible stego? Peoples choice of stego is highly dependent on
> message size,message contents, repetition, and placement.
>
> --
> Rob Fuller | Mubix
> Room362.com | Hak5.org | TheAcademyPro.com
>
>
>
> On Wed, Jan 27, 2010 at 7:42 AM, Jim Halfpenny <jim.halfpenny at gmail.com>
> wrote:
> > Image metadata may survive (EXIF, copyright strings), it really depends
> on
> > how the program manipulating the image handles the image and metadata
> parts
> > of the file. Chances are if the hidden data is in the image data then it
> > will not survive resizing, changes to colour deptt, colour maps etc.
> >
> > Jim
> >
> > 2010/1/27 Adrian Crenshaw <irongeek at irongeek.com>
> > > Hi all,
> > >     Does anyone know of any image based steganography that survives
> > > resizing of the image? I'm looking into using blind drops, but many
> sites
> > > alter images that they post.
> > >
> > > Thanks,
> > > Adrian
> > >
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