From: Jason Vagner <jlv@signet.sig.bsh.com>
To: cypherpunks@toad.com
Message Hash: 0eacc35e65a50117b95f35bfa8963da81a3c8d6a9067071acd1ccc6a209d9b21
Message ID: <Pine.SGI.3.95.960908160931.19582B-100000@www>
Reply To: <199609070003.TAA11985@pentagon.io.com>
UTC Datetime: 1996-09-08 22:49:51 UTC
Raw Date: Mon, 9 Sep 1996 06:49:51 +0800
From: Jason Vagner <jlv@signet.sig.bsh.com>
Date: Mon, 9 Sep 1996 06:49:51 +0800
To: cypherpunks@toad.com
Subject: Photoshop, Steganograhy, and cypherpunks?
In-Reply-To: <199609070003.TAA11985@pentagon.io.com>
Message-ID: <Pine.SGI.3.95.960908160931.19582B-100000@www>
MIME-Version: 1.0
Content-Type: text/plain
> > 1) If I hide some PGP encrypted data in a
> > gif, jpg or wav file will there be any tell tale
> > signs to the naked eye of an expert? If yes,
> > what are they?
>
> If you stego too many bits in a figure, it may become apparent.
The new version of Photoshop coming out this fall includes the ability to
embed "digital watermarking":
(from http://www.news.com/News/Item/0,4,3188,00.html:
Digital watermarking
adds copyright information to
a photograph that doesn't alter the photo's
appearance. The watermark is detectable even
after the photo is edited or printed and rescanned.
Question: Will stegonagrphying (?) the picture with noise mar the
watermark? Will a digital signature *and* something embedded into the
graphic through steganography seriosly affect a 24-bit image?
Furthermore: What about browsers? Could cookies or binary info be embedded
into images on the fly so that a java applet could preserve information or
states between pages, of different sites?
Just thoughts..
Jason Vagner
Return to September 1996
Return to “makof@alias.cyberpass.net (makofi)”