Re: [WM]: What is different bewteen watermarking and steganography

["mojtaba mahdavi" <mahdavi110@gmail.com>]

The summery can be as follows:

1- In Steganography hidden data is matter of importance and the carrier is not. In watermarking the carrier is matter of importance
and data is just for some verifications.
2- Since in steganography hidden data is important so capacity (amount of message that can be embedded in carrier) and security
(undetectability against visual and statistical attacks ) are important and robustness is no= t (there is some robust steganographic
method too). In Watermarking since the carrier is important and we just want to embed a mark into carrier so don't care (most often)
about its security  and capacity but robustness against removal attacks is important.

OK ?

On 2/27/06, Bloom Jeffrey <Jeffrey.Bloom@thomson.net> wrote:
>
> Huynh Thai Hoc,
>
> You have received a number of different answers.  Dr. Johnson's answer
> is the most widely accepted.  In watermarking, the payload carries
> information about the carrier.  The carrier is the item of primary
> importance.  This is what motivates the need for perceptual
> similarity.
> You can't watermark a movie by replacing it with a different movie.
> On the other hand, in steganography, the carrier is simply an
> unimportant envelope designed to carry the important information.
> Here, high fidelity is not required, instead, the marked or stego work
> must look "normal" or "typical"; even under statistical study.  For
> example, it may be OK to introduce visible blocking artifacts if those
> artifacts appear indistinguishable from JPEG artifacts.  In steg, you
> can often pick the cover work from a desired distribution.
>
> --------------------------------------------------------
> Dr. Jeffrey A Bloom, Content Security Research Group Thomson Corporate
> Research, Princeton, NJ, USA http://www.geocities.com/Jeffrey_Bloom
> (609) 987-7727, (609) 987-7299 fax
>
>
> > -----Original Message-----
> > Sent: Sunday, February 26, 2006 9:12 PM
> > Subject: Re: [WM]: What is different bewteen watermarking and
> >steganography    The primary difference between watermarking and
> >steganography is  implementation and intent of use.
> >
> > In short:
> >
> > Under Steganography, the embedded message may have nothing to do
> > with
> the
> > carrier.  The carrier is simply a mechanism to pass the message.
> > The object of the communication channel is the hidden
> message.
> >
> > Under Watermarking, the embedded information can be considered an
> >attribute of the carrier and conveys additional information or
> >properties about the carrier.  The primary object of the
> >communication channel is the carrier itself.
> >
> > --
> >
> > Neil
> >
> > Neil F. Johnson, Ph.D.
> > http://www.jjtc.com
> > nfj@jjtc.com
> >
> > >    Hi everyone,
> > >
> > >   I am confusing about the terminology "watermarking" and
> > "steganography".
> > > Could you help me to classify these terminology. What is different
> > > bewteen watermarking and steganography?
> > >
> > >   I am looking forward to hearing from you.
> > >   Thank you very much
> > >
> > >   Huynh Thai Hoc
> > >
> > >   University of Technology - HCMC - VietNam


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