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112 lines
3.3 KiB
ReStructuredText
112 lines
3.3 KiB
ReStructuredText
Using Stegano as a Python module
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================================
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You can find more examples in the
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`unit tests directory <https://git.sr.ht/~cedric/stegano/tree/master/tests>`_.
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LSB method
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----------
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.. code-block:: python
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Python 3.5.1 (default, Dec 7 2015, 11:33:57)
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[GCC 4.9.2] on linux
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Type "help", "copyright", "credits" or "license" for more information.
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>>> from stegano import lsb
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>>> secret = lsb.hide("./tests/sample-files/Lenna.png", "Hello world!")
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>>> secret.save("./Lenna-secret.png")
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>>> print(lsb.reveal("./Lenna-secret.png"))
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Hello world!
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LSB method with 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:: python
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Python 3.5.1 (default, Dec 7 2015, 11:33:57)
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[GCC 4.9.2] on linux
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Type "help", "copyright", "credits" or "license" for more information.
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>>> from stegano import lsbset
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>>> from stegano.lsbset import generators
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# Hide a secret with the Sieve of Eratosthenes
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>>> secret_message = "Hello World!"
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>>> secret_image = lsbset.hide("./tests/sample-files/Lenna.png",
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secret_message,
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generators.eratosthenes())
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>>> secret_image.save("./image.png")
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# Try to decode with another generator
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>>> message = lsbset.reveal("./image.png", generators.fibonacci())
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Traceback (most recent call last):
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File "<stdin>", line 1, in <module>
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File "/home/cedric/projects/Stegano/stegano/lsbset/lsbset.py", line 111, in reveal
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for color in img_list[generated_number]:
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IndexError: list index out of range
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# Decode with Eratosthenes
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>>> message = lsbset.reveal("./image.png", generators.eratosthenes())
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>>> message
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'Hello World!'
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>>> # Generators available
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>>> import inspect
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>>> all_generators = inspect.getmembers(generators, inspect.isfunction)
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>>> for generator in all_generators:
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... print(generator[0], generator[1].__doc__)
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...
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Dead_Man_Walking None
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OEIS_A000217
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http://oeis.org/A000217
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Triangular numbers: a(n) = C(n+1,2) = n(n+1)/2 = 0+1+2+...+n.
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ackermann
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Ackermann number.
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carmichael None
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eratosthenes
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Generate the prime numbers with the sieve of Eratosthenes.
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eratosthenes_composite
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Generate the composite numbers with the sieve of Eratosthenes.
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fermat
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Generate the n-th Fermat Number.
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fibonacci
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A generator for Fibonacci numbers, goes to next number in series on each call.
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This generator start at 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377, 610, 987, 1597, 2584, 4181, 6765, 10946, ...
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See: http://oeis.org/A000045
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identity
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f(x) = x
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log_gen
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Logarithmic generator.
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mersenne
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Generate 2^n-1.
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syracuse
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Generate the sequence of Syracuse.
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Description field of the image
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------------------------------
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For JPEG and TIFF images.
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.. code-block:: python
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Python 3.5.1 (default, Dec 7 2015, 11:33:57)
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[GCC 4.9.2] on linux
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Type "help", "copyright", "credits" or "license" for more information.
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>>> from stegano import exifHeader
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>>> secret = exifHeader.hide("./tests/sample-files/20160505T130442.jpg",
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"./image.jpg", secret_message="Hello world!")
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>>> print(exifHeader.reveal("./image.jpg"))
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