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109 lines
3.4 KiB
ReStructuredText
109 lines
3.4 KiB
ReStructuredText
Using Stéganô in command line for your scripts
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==============================================
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Display help
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------------
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.. code-block:: bash
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$ lsb --help
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usage: 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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$ lsb hide --help
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usage: lsb hide [-h] -i INPUT_IMAGE_FILE (-m SECRET_MESSAGE | -f SECRET_FILE)
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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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Input image file.
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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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$ lsb reveal --help
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usage: lsb reveal [-h] -i INPUT_IMAGE_FILE [-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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-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 with the LSB method
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--------------------------------------------------
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.. code-block:: bash
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$ lsb hide -i ./tests/sample-files/Lenna.png -m 'Hello World!' -o ./Lenna_enc.png
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$ lsb reveal -i ./Lenna_enc.png
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Hello World!
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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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$ 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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$ lsb reveal -i ./Montenach_enc.png -o ./song.ogg
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Hide and reveal a text message with the LSB method and generated sets
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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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.. code-block:: bash
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# Hide the message with the Sieve of Eratosthenes
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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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lsb-set reveal --generator mersenne -i ./surprise.png
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# Try to reveal with fermat numbers
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lsb-set reveal --generator fermat -i ./surprise.png
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# Try to reveal with carmichael numbers
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lsb-set reveal --generator carmichael -i ./surprise.png
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# Try to reveal with Sieve of Eratosthenes
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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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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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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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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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lsb reveal -i ./enc-identity.png
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