Dirt cheap steganography

This steg module is based on code, ideas and images from http://blog.wolfram.com/2010/07/08/doing-spy-stuff-with-mathematica/ .
It requires numpy & matplotlib but can be reworked to depend on pypng instead of matplotlib

Sample usage

$ python2.7 simple_decode.py --help

Usage:

Hide/Unhide info in images as described in this post:

http://blog.wolfram.com/2010/07/08/doing-spy-stuff-with-mathematica/

usage: simple_decode.py [options]

Options:

-h, --help show this help message and exit

-v DEBUG, --verbose=DEBUG

Debug. Higher integers increases verbosity

-e ENCODED_FILE, --encoded_file=ENCODED_FILE

Encoded PNG file to work with. Default is

steg_chicken_secret.png

-d DATA_FILE, --data_file=DATA_FILE

File with decoded data or with data to encode.

Example decode of data hidden in the wolfram blog images

$ python2.7 simple_decode.py -e steg_chicken_secret.png -d chicken.txt
$ cat chicken.txt ;echo

This is a secret message.



$ python2.7 simple_decode.py -e alice.png -d alice.txt

$ file alice.txt

alice.txt: UTF-8 Unicode English text, with very long lines, with no line terminators



$ python2.7 simple_decode.py -e finalImage.png -d data.jpg

$ file data.jpg

data.jpg: JPEG image data, JFIF standard 1.01, comment: "Created by Wolfram Mathematica "