"Mayayana" on Thu, 13 Feb 2020 19:05:04
-0500 typed in alt.windows7.general the following:
"Shadow" wrote

| Since almost all image formats are compressed, do you know a
| tool that can un-compress the data to look for "hidden" text or files?
| There's a lot of apps that do steganography, so there must be
| something to identify the method used (a generic un-packer).
| The NSA would be naked without one. LOL.
|

Mysterious. So it hides extra bytes? Since each format
is different I don't know of any easy way to track it, or
to create the hidden text.

Not so much "hides" as substitutes not enough to be "noticeable"
to "casual inspection." How many "bad pixels" can you have before the
picture "fails" as an image.

It is harder to do with written text, there isn't the redundancy.
"But iF I leVitate eXtra aNdoids, vaRious eleCtrons traVel ovEr hill
and daLe anD to yOrk." [First letter of each miscapitalized word.)

I recall a movie where the message was smuggled out by writing
over letters with a lead (metal) pencil. You had to X-ray the pages
to read it, but, hey, it "worked".


--
pyotr filipivich
Next month's Panel: Graft - Boon or blessing?