Wavelets.

[Wombat]

Hi,
I was reading that steg can be detected by using wavelet analysis.
This gave me the idea of hiding data either within the wavelet coefficients or within one of the `scale` images.
Has anyone played with this?

[littlejohn]

After some (fast) googling I found this ftp directory:

ftp://ftp.funet.fi/pub/crypt/steganography

I haven't already tried any of the tools listed there, but maybe there are some interesting ones (jpeg-jsteg-v4.diff.gz is a patch to the Independent JPEG Group's jpeg tools which, I guess, uses the steganography wavelet method you were pointing to).

cheers,
lj

ps
a paper on these methods is
http://www.csa.syr.edu/Jacob_Jackson.pdf
but there's a lot of bibliography indeed.