The only free package I know of is called jpeg-jsteg.� A search for jsteg on
altavista reveals many links, including Win95 shells for operating the DOS
command line jpeg-jsteg program.� It was originally written for UNIX, of
course, using the jpegv4 open source library (also search for that).
You can embed almost as much hidden data in a jpeg file as there is jpeg
data in the file to begin with.� The nature of jpeg - lossy compression -
gives lots of room to hide other data, which appear in the visible image as
ordinary jpeg artifacts.� The only way to trivially detect that the jpeg
file may hold hidden data, is that it's larger than it should be given its
compression factor.
I wonder how many porn sites are actually run by Chinese intelligence
agents, distributing US nuclear secrets.
-----Original Message-----
From: Phillips, Steven W (Steve), GOVMK <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED] <[EMAIL PROTECTED]>
Date: Wednesday, May 26, 1999 7:45 PM
Subject: Hide and Seek Programs
>Does anyone have information on programs that can be used to hide files in
>GIF images?� I have never seen this done, but have been told that they are
>call Hide and Seek programs.� If anyone knows how this is done and whether
>or not the presence of a file in a GIF image can be detected using some
sort
>of file scanner, please let me know.
>
>TIA,
>
>Steven Phillips
>-
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