[ILUG] Re: please tell me
silvandelaney at eircom.net
Thu Sep 20 14:49:26 IST 2001
20/09/2001 12:11:57, Niall O Broin <niall at linux.ie> wrote
so what is the answer in view to my question than?
>Except that most (no, make that all) image steganographic systems break when
>you apply certain filters to the image e.g Gaussian blur, or scale and
>recompress as JPEG. I bluntly say all systems, because for any particular
>kind of steganography, you can come up with some kind of filter which will
>kill it without making much more visible difference to the image than the
>original steganography did.
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