outguess
steganography tool that hides data in JPEG images
TLDR
Embed data in image
$ outguess -d [secret.txt] [cover.jpg] [output.jpg]
Extract hidden data$ outguess -r [stego.jpg] [output.txt]
Embed with password$ outguess -k "[password]" -d [secret.txt] [cover.jpg] [output.jpg]
Extract with password$ outguess -k "[password]" -r [stego.jpg] [output.txt]
Check embedding capacity$ outguess -c [cover.jpg]
SYNOPSIS
outguess [options] [input] [output]
DESCRIPTION
OutGuess is a steganography tool that hides data in JPEG images. It preserves image statistics to resist statistical analysis, making detection harder than simpler methods.OutGuess modifies DCT coefficients in ways that maintain expected statistical distributions.
PARAMETERS
-d file
Data file to embed.-r
Extract mode.-k key
Password/key.-c
Check capacity.-F
Force embedding.-e
Use error correction.
EXAMPLE
$ # Hide message
outguess -k "secret" -d message.txt photo.jpg stego.jpg
# Recover message
outguess -k "secret" -r stego.jpg recovered.txt
outguess -k "secret" -d message.txt photo.jpg stego.jpg
# Recover message
outguess -k "secret" -r stego.jpg recovered.txt
INSTALL
sudo apt install outguess
nix profile install nixpkgs#outguess
CAVEATS
JPEG only. Repeated embedding degrades image. Capacity depends on image complexity. Password provides encryption.
HISTORY
OutGuess was developed by Niels Provos as a steganographic tool resistant to statistical steganalysis techniques.