Using Stéganô in command line for your scripts

Display help

$ lsb --help
usage: lsb [-h] {hide,reveal} ...

positional arguments:
  {hide,reveal}  sub-command help
    hide         hide help
    reveal       reveal help

optional arguments:
  -h, --help     show this help message and exit
$ lsb hide --help
usage: lsb hide [-h] -i INPUT_IMAGE_FILE (-m SECRET_MESSAGE | -f SECRET_FILE)
                -o OUTPUT_IMAGE_FILE

optional arguments:
  -h, --help            show this help message and exit
  -i INPUT_IMAGE_FILE, --input INPUT_IMAGE_FILE
                        Input image file.
  -m SECRET_MESSAGE     Your secret message to hide (non binary).
  -f SECRET_FILE        Your secret to hide (Text or any binary file).
  -o OUTPUT_IMAGE_FILE, --output OUTPUT_IMAGE_FILE
                        Output image containing the secret.
$ lsb reveal --help
usage: lsb reveal [-h] -i INPUT_IMAGE_FILE [-o SECRET_BINARY]

optional arguments:
  -h, --help            show this help message and exit
  -i INPUT_IMAGE_FILE, --input INPUT_IMAGE_FILE
                        Input image file.
  -o SECRET_BINARY      Output for the binary secret (Text or any binary
                        file)

Hide and reveal a text message with the LSB method

$ lsb hide -i ./tests/sample-files/Lenna.png -m 'Hello World!' -o ./Lenna_enc.png
$ lsb reveal -i ./Lenna_enc.png
Hello World!

Hide and reveal a binary file

$ wget http://www.gnu.org/music/free-software-song.ogg
$ lsb hide -i ./tests/sample-files/Montenach.png -f ./free-software-song.ogg -o ./Montenach_enc.png
$ rm free-software-song.ogg
$ lsb reveal -i ./Montenach_enc.png -o ./song.ogg

Hide and reveal a text message with the LSB method and generated sets

Sets are used in order to select the pixels where the message will be hidden.

# Hide the message with the Sieve of Eratosthenes
lsb-set hide -i ./tests/sample-files/Montenach.png --generator eratosthenes -m 'Joyeux Noël!' -o ./surprise.png

# Try to reveal with Mersenne numbers
lsb-set reveal --generator mersenne -i ./surprise.png

# Try to reveal with fermat numbers
lsb-set reveal --generator fermat -i ./surprise.png

# Try to reveal with carmichael numbers
lsb-set reveal --generator carmichael -i ./surprise.png

# Try to reveal with Sieve of Eratosthenes
lsb-set reveal --generator eratosthenes -i ./surprise.png

An other example:

# Hide the message - LSB with a set defined by the identity function (f(x) = x).
lsb-set hide -i ./tests/sample-files/Montenach.png -o ./enc-identity.png --generator identity -m 'I like steganography.'

# Hide the message - LSB only.
lsb hide -i ./tests/sample-files/Montenach.png -o ./enc.png -m 'I like steganography.'

# Check if the two generated files are the same.
sha1sum ./enc-identity.png ./enc.png

# The output of lsb is given to lsb-set.
lsb-set reveal -i ./enc.png --generator identity

# The output of lsb-set is given to lsb.
lsb reveal -i ./enc-identity.png