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

# List all available generators
$ lsb-set list-generators
Dead_Man_Walking
    Dead Man Walking.

OEIS_A000217
    http://oeis.org/A000217
    Triangular numbers: a(n) = C(n+1,2) = n(n+1)/2 = 0+1+2+...+n.

ackermann
    Ackermann number.

carmichael
    https://oeis.org/A002997
    Composite numbers n such that a^(n-1) == 1 (mod n) for every a coprime to n.

eratosthenes
    Generate the prime numbers with the sieve of Eratosthenes.

eratosthenes_composite
    Generate the composite numbers with the sieve of Eratosthenes.

fermat
    Generate the n-th Fermat Number.

fibonacci
    https://oeis.org/A000045
    A generator for Fibonacci numbers, goes to next number in series on each call.
    This generator start at 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377, 610, 987, 1597, 2584, 4181, 6765, 10946, ...

identity
    f(x) = x

log_gen
    Logarithmic generator.

mersenne
    Generate 2^n-1.

syracuse
    Generate the sequence of Syracuse

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 --generator identity -m 'I like steganography.' -o ./enc-identity.png

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

# 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

Hide and reveal a text message with the red portion of a pixel

$ stegano-red hide --help
usage: stegano-red hide [-h] [-i INPUT_IMAGE_FILE] [-m SECRET_MESSAGE]
                    [-o OUTPUT_IMAGE_FILE]

optional arguments:
-h, --help            show this help message and exit
-i INPUT_IMAGE_FILE, --input INPUT_IMAGE_FILE
                    Image file
-m SECRET_MESSAGE     Your secret message to hide (non binary).
-o OUTPUT_IMAGE_FILE, --output OUTPUT_IMAGE_FILE
                    Image file

$ stegano-red hide -i ./tests/sample-files/Lenna.png -m 'Basic steganography technique.' -o ~/Lenna1.png

$ stegano-red reveal -i ~/Lenna1.png
Basic steganography technique.