• Tutorial
  • Getting Stéganô
  • Installation
  • Using Stéganô as a Python module
  • Using Stéganô in command line for your scripts
    • Display help
    • Hide and reveal a text message
    • Hide and reveal a text message with the LSB method using sets
    • Hide and reveal a binary file
    • Hide and reveal a message by using the description field of the image
    • Steganalysis
  • Examples
    • Reveal a text message
    • Hide and reveal an audio file
    • Hide and reveal using Exif information

Tutorial¶

Getting Stéganô¶

1 hg clone http://hg.cedricbonhomme.org/stegano/
2 cd stegano/

Installation¶

python setup.py install

Now you will be able to use Stéganô in your Python program.

Using Stéganô as a Python module¶

 1 Python 2.7 (r27:82500, Jul  5 2010, 10:14:47) 
 2 [GCC 4.3.2] on linux2
 3 Type "help", "copyright", "credits" or "license" for more information.
 4 >>> from stegano import slsb
 5 
 6 >>> secret = slsb.hide("./pictures/Lenna.png", "Hello world!")
 7 >>> secret.save("./Lenna-secret.png")
 8 
 9 >>> slsb.reveal("./Lenna-secret.png")
10 Hello world!

Using Stéganô in command line for your scripts¶

Display help¶

$ slsb --help
Usage: slsb [options]

Options:
  --version             show program's version number and exit
  -h, --help            show this help message and exit
  --hide                Hides a message in an image.
  --reveal              Reveals the message hided in an image.
  -i INPUT_IMAGE_FILE, --input=INPUT_IMAGE_FILE
                        Input image file.
  -o OUTPUT_IMAGE_FILE, --output=OUTPUT_IMAGE_FILE
                        Output image containing the secret.
  -m SECRET_MESSAGE, --secret-message=SECRET_MESSAGE
                        Your secret message to hide (non binary).
  -f SECRET_FILE, --secret-file=SECRET_FILE
                        Your secret to hide (Text or any binary file).
  -b SECRET_BINARY, --binary=SECRET_BINARY
                        Output for the binary secret (Text or any binary
                        file).

$ slsb-set --help
Usage: slsb-set [options]

Options:
  --version             show program's version number and exit
  -h, --help            show this help message and exit
  --hide                Hides a message in an image.
  --reveal              Reveals the message hided in an image.
  -i INPUT_IMAGE_FILE, --input=INPUT_IMAGE_FILE
                        Input image file.
  -g GENERATOR_FUNCTION, --generator=GENERATOR_FUNCTION
                        Generator
  -o OUTPUT_IMAGE_FILE, --output=OUTPUT_IMAGE_FILE
                        Output image containing the secret.
  -m SECRET_MESSAGE, --secret-message=SECRET_MESSAGE
                        Your secret message to hide (non binary).
  -f SECRET_FILE, --secret-file=SECRET_FILE
                        Your secret to hide (Text or any binary file).
  -b SECRET_BINARY, --binary=SECRET_BINARY
                        Output for the binary secret (Text or any binary
                        file).

Hide and reveal a text message¶

$ slsb --hide -i ./pictures/Lenna.png -o ./pictures/Lenna_enc.png -m 'Hello World!'

$ slsb --reveal -i ./pictures/Lenna_enc.png
HelloWorld!

Hide and reveal a text message with the LSB method using sets¶

For example if you want to hide a message with the sieve of Eratosthenes:

$ slsb-set --hide -i examples/pictures/Montenach.png -o ~/enc.png --generator eratosthenes -m 'Bonjour'
$ slsb-set --reveal -i ~/enc.png --generator eratosthenes
Bonjour

$ slsb-set --reveal -i ~/enc.png --generator mersenne
Impossible to detect message.

Hide and reveal a binary file¶

$ wget http://www.gnu.org/music/free-software-song.ogg
$ slsb --hide -i ./pictures/Montenach.png -o ./pictures/Montenach_enc.png -f ./free-software-song.ogg
$ rm free-software-song.ogg
$ slsb --reveal -i ./pictures/Montenach_enc.png -b ./song.ogg

Hide and reveal a message by using the description field of the image¶

$ ./exif-header.py --hide -i ./Elisha-Cuthbert.jpg -o ./Elisha-Cuthbert_enc.jpg -f ./fileToHide.txt

$ ./exif-header.py --reveal -i ./Elisha-Cuthbert_enc.jpg

Steganalysis¶

$ steganalysis-parity -i ./pictures./Lenna_enc.png -o ./pictures/Lenna_enc_st.png

Examples¶

Reveal a text message¶

$ wget http://projects.cedricbonhomme.org/attachments/2/lena-secret.png
$ slsb --reveal -i lena-secret.png

$ slsb-set --reveal -i lena-secret.png --generator identity

Hide and reveal an audio file¶

$ wget http://www.gnu.org/music/free-software-song.ogg
$ slsb --hide -i ./pictures/Montenach.png -o ./pictures/Montenach_enc.png -f ./free-software-song.ogg
$ rm free-software-song.ogg
$ slsb --reveal -i ./pictures/Montenach_enc.png -b ./cool-song.ogg

Hide and reveal using Exif information¶

elisha-secret.jpg

$ wget http://projects.cedricbonhomme.org/attachments/3/elisha-secret.jpg
$ ./exif-header.py --reveal -i ./Elisha-Cuthbert_enc.jpg