Implementing-cryptography-using-python

Chapter 6 ■ Using Cryptography with Images 193
>>> modfile = ‘stegaudio_dogs.png’
>>> decrypted = ‘decrypted_sample.mp3’
Use the retrieve() method to pull out the media file and write it to a new
file that was specified in the decrypted variable:
>>> secret_bin = crypto_steganography.retrieve(modfile)
>>> with open(decrypted, 'wb') as f:
>>> f.write(secret_bin)
Now we will put it together with a working example that will hide a media
file inside an image of dogs named do gs.jpg. There is nothing special about
this image shown in Figure 6.13. It is simply just a photo of my two dogs taken
with my cell phone camera; it is, however, a large enough file in which to hide
a 700 KB MP3 file.
Figure 6.13: High-definition photo of dogs
The following code will take an MP3 file and hide it inside a large JPG file.
from cryptosteganography import CryptoSteganography
# open sound file
mediafile = 'chapter6/steg/file_example_MP3_700KB.mp3'
message = None
with open(mediafile, "rb") as f:
message = f.read()