How to use Steganography to Hide Secret Data in Images in Python

To run this:

pip3 install -r requimements.txt

python steganography.py --help

Output:

    usage: steganography.py [-h] [-t TEXT] [-e ENCODE] [-d DECODE]

Steganography encoder/decoder, this Python scripts encode data within images.

optional arguments:
-h, --help            show this help message and exit
-t TEXT, --text TEXT  The text data to encode into the image, this only
                        should be specified for encoding
-e ENCODE, --encode ENCODE
                        Encode the following image
-d DECODE, --decode DECODE
                        Decode the following image

To encode some data to the image image.PNG:

python steganography.py -e image.PNG -t "This is some secret data."

This will write another image image_encoded.PNG with data encoded in it and outputs:

[*] Maximum bytes to encode: 125028
[*] Encoding data...
[+] Saved encoded image.

To decode the data containing the image encoded_image.PNG, use:

python steganography.py -d encoded_image.PNG

Outputs:

[+] Decoding...
[+] Decoded data: This is some secret data.

To encode the foo.pdf file into the image.PNG image, using steganography_advanced.py script:

$ python steganography_advanced.py -e image.PNG -f foo.pdf -b 1

Output:

[*] Maximum bytes to encode: 125028
[*] Data size: 84158
[*] Encoding data...
[+] Saved encoded image.

Now decoding it into a file foo_decoded.pdf:

python steganography_advanced.py -d image_encoded.PNG -f foo_decoded.pdf -b 1
[+] Decoding...
[+] File decoded, foo_decoded.pdf is saved successfully.

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