On Thu, 13 Feb 2020 19:05:04 -0500, "Mayayana"
wrote:

"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.

No, it calculates the "empty space" in the image file and uses
that to hide the file/data. To casual user using an image viewer, the
image would appear unaltered. Same size, date and even EXIF data -
only the checksum would differ - but who checks that?
Apart from you, of course.

[]'s

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