Problem with lsb.reveal()

[swiftcynic]

>>> from stegano import lsb
>>> secret=lsb.hide("./inputs/input.jpg","Hello")
>>> secret.save("./outputs/output.jpg")
>>> print(lsb.reveal("./outputs/output.jpg"))
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Users/dhruvsalot/miniforge3/envs/temp/lib/python3.8/site-packages/stegano/lsb/lsb.py", line 89, in reveal
    if revealer.decode_pixel((col, row)):
  File "/Users/dhruvsalot/miniforge3/envs/temp/lib/python3.8/site-packages/stegano/tools.py", line 209, in decode_pixel
    raise IndexError("Impossible to detect message.")
IndexError: Impossible to detect message.

Image used:

Python version: 3.8.18
Stegano version: 0.11.3

[cedricbonhomme]

Hello,

This is because you used the JPEG file type. Try with PNG. I just did it and it worked. With JPEG you can lose data inside the file.

If you want to hide something in a JPEG file, a more robust way is to use the metadata of the file.

[luke-on-security]

thank you @cedricbonhomme . I just discovered this nice project and wanted to ask this question !

[cedricbonhomme]

$ wget https://raw.githubusercontent.com/cedricbonhomme/Stegano/master/tests/sample-files/Lenna.png
$ stegano-lsb hide -i Lenna.png -m "Important message." -o Lenna-hide.png
$ stegano-lsb reveal -i Lenna-hide.png 
Important message.

As you can see here I used the tool in command line.