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247 lines
6.7 KiB
ReStructuredText
247 lines
6.7 KiB
ReStructuredText
Using Stéganô in command line
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=============================
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The command ``stegano-lsb``
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^^^^^^^^^^^^^^^^^^^^^^^^^^^
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Hide and reveal a message with the LSB method.
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Display help
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------------
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.. code-block:: bash
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$ stegano-lsb --help
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usage: stegano-lsb [-h] {hide,reveal} ...
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positional arguments:
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{hide,reveal} sub-command help
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hide hide help
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reveal reveal help
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optional arguments:
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-h, --help show this help message and exit
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.. code-block:: bash
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$ stegano-lsb hide --help
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usage: stegano-lsb hide [-h] -i INPUT_IMAGE_FILE [-e {UTF-8,UTF-32LE}]
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(-m SECRET_MESSAGE | -f SECRET_FILE) -o
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OUTPUT_IMAGE_FILE
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optional arguments:
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-h, --help show this help message and exit
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-i INPUT_IMAGE_FILE, --input INPUT_IMAGE_FILE
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Input image file.
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-e {UTF-8,UTF-32LE}, --encoding {UTF-8,UTF-32LE}
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Specify the encoding of the message to hide. UTF-8
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(default) or UTF-32LE.
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-m SECRET_MESSAGE Your secret message to hide (non binary).
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-f SECRET_FILE Your secret to hide (Text or any binary file).
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-o OUTPUT_IMAGE_FILE, --output OUTPUT_IMAGE_FILE
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Output image containing the secret.
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.. code-block:: bash
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$ stegano-lsb reveal --help
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usage: stegano-lsb reveal [-h] -i INPUT_IMAGE_FILE [-e {UTF-8,UTF-32LE}]
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[-o SECRET_BINARY]
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optional arguments:
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-h, --help show this help message and exit
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-i INPUT_IMAGE_FILE, --input INPUT_IMAGE_FILE
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Input image file.
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-e {UTF-8,UTF-32LE}, --encoding {UTF-8,UTF-32LE}
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Specify the encoding of the message to reveal. UTF-8
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(default) or UTF-32LE.
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-o SECRET_BINARY Output for the binary secret (Text or any binary
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file).
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Hide and reveal a text message
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------------------------------
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.. code-block:: bash
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$ stegano-lsb hide -i ./tests/sample-files/Lenna.png -m 'Hello World!' -o ./Lenna_enc.png
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$ stegano-lsb reveal -i ./Lenna_enc.png
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Hello World!
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Specify an encoding
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-------------------
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.. code-block:: bash
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$ stegano-lsb hide -i ./tests/sample-files/Lenna.png -m 'I love 🍕 and 🍫.' -e UTF-32LE -o ./Lenna_enc.png
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$ stegano-lsb reveal -i ./Lenna_enc.png
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I love 🍕 and 🍫.
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The default encoding is UTF-8.
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Hide and reveal a binary file
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-----------------------------
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.. code-block:: bash
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$ wget http://www.gnu.org/music/free-software-song.ogg
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$ stegano-lsb hide -i ./tests/sample-files/Montenach.png -f ./free-software-song.ogg -o ./Montenach_enc.png
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$ rm free-software-song.ogg
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$ stegano-lsb reveal -i ./Montenach_enc.png -o ./song.ogg
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The command ``stegano-lsb-set``
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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Sets are used in order to select the pixels where the message will be hidden.
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Hide and reveal a text message
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------------------------------
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.. code-block:: bash
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# Hide the message with the Sieve of Eratosthenes
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$ stegano-lsb-set hide -i ./tests/sample-files/Montenach.png --generator eratosthenes -m 'Joyeux Noël!' -o ./surprise.png
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# Try to reveal with Mersenne numbers
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$ stegano-lsb-set reveal --generator mersenne -i ./surprise.png
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# Try to reveal with fermat numbers
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$ stegano-lsb-set reveal --generator fermat -i ./surprise.png
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# Try to reveal with carmichael numbers
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$ stegano-lsb-set reveal --generator carmichael -i ./surprise.png
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# Try to reveal with Sieve of Eratosthenes
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$ stegano-lsb-set reveal --generator eratosthenes -i ./surprise.png
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An other example:
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.. code-block:: bash
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# Hide the message - LSB with a set defined by the identity function (f(x) = x).
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stegano-lsb-set hide -i ./tests/sample-files/Montenach.png --generator identity -m 'I like steganography.' -o ./enc-identity.png
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# Hide the message - LSB only.
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stegano-lsb hide -i ./tests/sample-files/Montenach.png -m 'I like steganography.' -o ./enc.png
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# Check if the two generated files are the same.
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sha1sum ./enc-identity.png ./enc.png
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# The output of lsb is given to lsb-set.
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stegano-lsb-set reveal -i ./enc.png --generator identity
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# The output of lsb-set is given to lsb.
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stegano-lsb reveal -i ./enc-identity.png
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List all available generators
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------------------------------
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.. code-block:: bash
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$ stegano-lsb-set list-generators
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Generator id:
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ackermann
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Desciption:
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Ackermann number.
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Generator id:
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ackermann_naive
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Desciption:
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Ackermann number.
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Generator id:
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carmichael
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Desciption:
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Composite numbers n such that a^(n-1) == 1 (mod n) for every a coprime
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to n.
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https://oeis.org/A002997
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Generator id:
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composite
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Desciption:
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Generate the composite numbers using the sieve of Eratosthenes.
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https://oeis.org/A002808
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Generator id:
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eratosthenes
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Desciption:
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Generate the prime numbers with the sieve of Eratosthenes.
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https://oeis.org/A000040
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Generator id:
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fermat
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Desciption:
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Generate the n-th Fermat Number.
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https://oeis.org/A000215
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Generator id:
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fibonacci
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Desciption:
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Generate the sequence of Fibonacci.
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https://oeis.org/A000045
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Generator id:
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identity
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Desciption:
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f(x) = x
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Generator id:
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log_gen
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Desciption:
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Logarithmic generator.
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Generator id:
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mersenne
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Desciption:
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Generate 2^p - 1, where p is prime.
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https://oeis.org/A001348
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Generator id:
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triangular_numbers
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Desciption:
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Triangular numbers: a(n) = C(n+1,2) = n(n+1)/2 = 0+1+2+...+n.
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http://oeis.org/A000217
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The command ``stegano-red``
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^^^^^^^^^^^^^^^^^^^^^^^^^^^
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Hide and reveal a text message with the red portion of a pixel.
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Display help
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------------
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.. code-block:: bash
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$ stegano-red hide --help
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usage: stegano-red hide [-h] [-i INPUT_IMAGE_FILE] [-m SECRET_MESSAGE]
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[-o OUTPUT_IMAGE_FILE]
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optional arguments:
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-h, --help show this help message and exit
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-i INPUT_IMAGE_FILE, --input INPUT_IMAGE_FILE
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Image file
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-m SECRET_MESSAGE Your secret message to hide (non binary).
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-o OUTPUT_IMAGE_FILE, --output OUTPUT_IMAGE_FILE
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Image file
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Hide and reveal a text message
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------------------------------
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.. code-block:: bash
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$ stegano-red hide -i ./tests/sample-files/Lenna.png -m 'Basic steganography technique.' -o ~/Lenna1.png
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$ stegano-red reveal -i ~/Lenna1.png
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Basic steganography technique.
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