Implementing-cryptography-using-python

194 Chapter 6 ■ Using Cryptography with Images
print()
print('The program is looking for an image named dogs.jpg\n')
origfile = "chapter6\steg\dogs.jpg"
print('The image with the hidden audio file will be called steg_audio_
dogs.png\n')
modfile = "chapter6\steg\steg_audio_dogs.png"
key = "1111222233334444!"
crypto_steganography = CryptoSteganography(key)
crypto_steganography.hide(origfile, modfile, message)
print('The extracted data will be called decrypted_sample2.mp3 \n')
decrypted = 'decrypted_sample2.mp3'
secret_bin = crypto_steganography.retrieve(modfile)
# Save the data to a new file
with open(decrypted, 'wb') as f:
f.write(secret_bin)
In Figure 6.14, you will see the output from the preceding Python recipe. The
code takes a media file and encrypts it inside the dogs.jpg image. You will see
that the original size of the dogs image is 598 KB. Once you embed the media
file, the outputted file is 4,983 KB. The previous example also extracts the media
file from the image and stores it as decrypted_sample.mp3. You can compare
the two MP3 files; you will find that they are identical.
Figure 6.14: Steganography with media