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