Hi,
The process is called steganography. Choose your favorite search
engine and find some freeware versions. Many offer the protection
of encryption before steganographically embedding the file.
Basically you are hiding a message within something that doesn't
look like it could contain a message or within a non-secret message.
The concept is old. As an example, you could format the number of
spaces after the period of each sentence in a text message to
represent Morse code - one space is a dot and two spaces are a dash.
Or perhaps you could count the number of letters on each line - the
number would represent the letter of the alphabet.
The concept of hiding files within bitmaps follows the general
rule that the least significant bit of each pixel can be changed
without any noticable overall change. (You should be able to do
the same with sound files.) I've heard that very high powered
pattern matching programs may be able to detect anomalies in files
generated by steganography. ..and I've also heard that subliminal
messages are steganographically imprinted into Ritz crackers - and
you just thought it was a random pattern. I generally occlude
that with peanut butter.
Hope this helps,
Chris Lonvick
Cisco Systems
Consulting Engineering
+1.512.378.1182
At 08:19 PM 5/26/99 -0400, Phillips, Steven W (Steve), GOVMK wrote:
>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
>-
>[To unsubscribe, send mail to [EMAIL PROTECTED] with
>"unsubscribe firewalls" in the body of the message.]
-
[To unsubscribe, send mail to [EMAIL PROTECTED] with
"unsubscribe firewalls" in the body of the message.]
