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Added steganalyse.py
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cedricbonhomme
parent
dd4bce8a4a
commit
3449484350
3 changed files with 90 additions and 6 deletions
46
LSB.py
46
LSB.py
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@ -15,15 +15,15 @@ def hide(img, message):
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LSB (Least Significant Bit) technique.
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"""
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encoded = img.copy()
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width, height = img.size
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width, height = img.size
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index = 0
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message = message + '~~ '
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message = message + '~~~'
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message_bits = tools.a2bits(message)
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npixels = width * height
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if len(message_bits) > npixels * 3:
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return """To long message (%s > %s).""" % (len(message_bits), npixels * 3)
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return """Too long message (%s > %s).""" % (len(message_bits), npixels * 3)
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for row in range(height):
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for col in range(width):
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@ -70,12 +70,46 @@ def reveal(img):
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if __name__ == '__main__':
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# Point of entry in execution mode
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original_image_file = "./pictures/Lenna.png"
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encoded_image_file = "Lenna_enc.png"
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original_image_file = "./pictures/2010-08-04T15:42:06.png"
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encoded_image_file = "./pictures/2010-08-04T15:42:06_enc.png"
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secret_message = "Avec la technique LSB (Least Significant Bit) l'oeil humain (un normal ;-)) ne voit plus la difference"
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Lorem_ipsum = """\
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Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
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Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.
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Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
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Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
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Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
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Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.
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Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
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Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
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Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
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Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.
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Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
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Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
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Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
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Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.
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Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
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Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
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Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
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Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.
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Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
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Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
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Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
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Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.
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Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
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Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
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Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
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Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.
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Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
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Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
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Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
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Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.
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Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
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Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
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"""
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img1 = Image.open(original_image_file)
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img_encoded = hide(img1, secret_message)
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img_encoded = hide(img1, Lorem_ipsum)
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if img_encoded:
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# Save it
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0
pictures/Lenna.png
Executable file → Normal file
0
pictures/Lenna.png
Executable file → Normal file
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Before Width: | Height: | Size: 464 KiB After Width: | Height: | Size: 464 KiB |
50
steganalyse.py
Normal file
50
steganalyse.py
Normal file
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@ -0,0 +1,50 @@
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#! /usr/local/bin/python
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#-*- coding: utf-8 -*-
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__author__ = "Cedric Bonhomme"
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__version__ = "$Revision: 0.1 $"
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__date__ = "$Date: 2010/10/01 $"
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from PIL import Image
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def steganalyse(img):
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"""
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Find a message in an image
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(with the LSB technique).
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"""
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encoded = img.copy()
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width, height = img.size
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bits = ""
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for row in range(height):
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for col in range(width):
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r, g, b = img.getpixel((col, row))
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if r % 2 == 0:
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r = 0
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else:
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r = 255
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if g % 2 == 0:
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g = 0
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else:
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g = 255
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if b % 2 == 0:
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b = 0
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else:
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b = 255
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encoded.putpixel((col, row), (r, g , b))
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return encoded
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if __name__ == '__main__':
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# Point of entry in execution mode
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original_image_file = "./pictures/2010-08-04T15:42:06.png"
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encoded_image_file = "./pictures/2010-08-04T15:42:06_enc.png"
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original_image_file_steganalysed = "./pictures/2010-08-04T15:42:06_steganalysed.png"
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encoded_image_file_steganalysed = "./pictures/2010-08-04T15:42:06_enc_steganalysed.png"
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img_original_image_file = Image.open(original_image_file)
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img_encoded_image_file = Image.open(encoded_image_file)
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img_original_image_steganalysde = steganalyse(img_original_image_file)
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img_encoded_image_steganalysed = steganalyse(img_encoded_image_file)
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img_original_image_steganalysde.save(original_image_file_steganalysed)
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img_encoded_image_steganalysed.save(encoded_image_file_steganalysed)
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