Least Significant Bit Steganography for bitmap images (.bmp and .png), WAV sound files, and byte sequences. Simple LSB Steganalysis (LSB extraction) for bitmap images.
License: MIT License
I am currently working as a Quantitative Analyst at Wells Fargo, primarily focusing on risk model research, development, maintenance, and monitoring. In much of my free time, I work on mathematical, statistical, and programming hobby projects.
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Some use cases that should obviously raise an error just crash the program.
E.g. trying to recover data from an invalid image in LSBSteg (say, the filesize tag doesn't make sense) will just crash even though this problem could be detected and a useful message could be printed.
Similarly, one should probably be allowed to analyze an image in LSBSteg without a payload of interest.
For LSBSteg,
Consider the following 100x100 image with transparency (and thus, four color channels).
When analyzing the image, LSBSteg claims that it can hide 7500 bytes with two LSBs.
$ stegolsb steglsb -a -i rgba_ex.png
Image resolution: (100, 100)
Using 2 LSBs, we can hide: 7500 B
File size tag: 2 B
which would be true for a typical RGB image (3*100*100*2/8 = 7500). However, we can actually use the alpha channel as well in this image, which should allow for 10k bytes to be stored.
Indeed, if you hide the supposed limit here, you'll see that the end of the image is unused. To my eye, it looks like it is using all four channels when it expected to be able to only use three.
$ stegolsb steglsb -h -i rgba_ex.png -s <(dd if=/dev/urandom bs=1 count=7498) -o rgba_ex_steg.png
Files read in 0.00s
7498 bytes hidden in 0.00s
Image overwritten in 0.00s
$ stegolsb stegdetect -i rgba_ex_steg.png
Runtime: 0.01s
The LSBSteg warning that an image cannot hold the requested payload doesn't print correctly (instead, it prints a logging error).
This should be fixed (in fact, it actually should raise an error and abort rather than attempting to continue in this case) and the other logging messages should be checked for correctness.
Python3.12's wave module now supports higher sample widths.
Locally, I managed to modify WavSteg.py so it can handle a 24 bit sample width 44100Hz .wav file, with an lsb-count of 1.
Both hiding and recovering worked well.
My knowledge of python is limited and my tests were few, so I'd rather not submit the ugly fix I made as a pull request.
Here is a summary anyway:
WavSteg.py: Both in hide_data() and recover_data()
If a sample_width of 3 is detected, change it to 4
34 sample_width = sound.getsampwidth()
35 if sample_width == 3:
36 sample_width = 4;The if protecting the maximum sample_width must be changed as well
python WavSteg.py -r -s /testing.wav -o wave.txt -n 1 -b 1000
Ran into an error during execution. Check input and try again.
unknown format: 6
I used pip3 install stego-lsb to install and everything seemed to go fine but in windows command prompt I'm getting
'stegolsb' is not recognized as an internal or external command,
operable program or batch file.
Anyone know how to fix that?
If it helps I'm using the windows store install of Python 3.8 and didn't have wheel installed when I installed stegolsb
Thanks much!
Hello,
On running stegolsb after installing it with pip (or git clone), I get this error :
Traceback (most recent call last):
File "/usr/local/bin/stegolsb", line 11, in <module>
load_entry_point('stego-lsb==1.0', 'console_scripts', 'stegolsb')()
File "/home/majordome/.local/lib/python2.7/site-packages/pkg_resources/__init__.py", line 489, in load_entry_point
return get_distribution(dist).load_entry_point(group, name)
File "/home/majordome/.local/lib/python2.7/site-packages/pkg_resources/__init__.py", line 2793, in load_entry_point
return ep.load()
File "/home/majordome/.local/lib/python2.7/site-packages/pkg_resources/__init__.py", line 2411, in load
return self.resolve()
File "/home/majordome/.local/lib/python2.7/site-packages/pkg_resources/__init__.py", line 2417, in resolve
module = __import__(self.module_name, fromlist=['__name__'], level=0)
File "/usr/local/lib/python2.7/dist-packages/stego_lsb-1.0-py2.7.egg/stego_lsb/cli.py", line 20, in <module>
from stego_lsb import LSBSteg, StegDetect, WavSteg, bit_manipulation
File "/usr/local/lib/python2.7/dist-packages/stego_lsb-1.0-py2.7.egg/stego_lsb/LSBSteg.py", line 88
log.debug(f"Files read".ljust(30) + f" in {time() - start:.2f}s")
^
SyntaxError: invalid syntax
Is it normal ?
Hi,
I'm running into an error when running stegolsb steglsb -r -i lsb_RGB.png -o output.zip, here's the error output :
Files read in 0.95s
Traceback (most recent call last):
File "/usr/local/bin/stegolsb", line 11, in <module>
load_entry_point('stego-lsb==1.1', 'console_scripts', 'stegolsb')()
File "/usr/local/lib/python3.6/dist-packages/Click-7.0-py3.6.egg/click/core.py", line 764, in __call__
return self.main(*args, **kwargs)
File "/usr/local/lib/python3.6/dist-packages/Click-7.0-py3.6.egg/click/core.py", line 717, in main
rv = self.invoke(ctx)
File "/usr/local/lib/python3.6/dist-packages/Click-7.0-py3.6.egg/click/core.py", line 1137, in invoke
return _process_result(sub_ctx.command.invoke(sub_ctx))
File "/usr/local/lib/python3.6/dist-packages/Click-7.0-py3.6.egg/click/core.py", line 956, in invoke
return ctx.invoke(self.callback, **ctx.params)
File "/usr/local/lib/python3.6/dist-packages/Click-7.0-py3.6.egg/click/core.py", line 555, in invoke
return callback(*args, **kwargs)
File "/usr/local/lib/python3.6/dist-packages/Click-7.0-py3.6.egg/click/decorators.py", line 17, in new_func
return f(get_current_context(), *args, **kwargs)
File "/usr/local/lib/python3.6/dist-packages/stego_lsb-1.1-py3.6.egg/stego_lsb/cli.py", line 93, in steglsb
LSBSteg.recover_data(input_fp, output_fp, lsb_count)
File "/usr/local/lib/python3.6/dist-packages/stego_lsb-1.1-py3.6.egg/stego_lsb/LSBSteg.py", line 154, in recover_data
data = recover_message_from_image(steg_image, num_lsb)
File "/usr/local/lib/python3.6/dist-packages/stego_lsb-1.1-py3.6.egg/stego_lsb/LSBSteg.py", line 145, in recover_message_from_image
color_data[tag_bit_height:], 8 * bytes_to_recover, num_lsb
File "/usr/local/lib/python3.6/dist-packages/stego_lsb-1.1-py3.6.egg/stego_lsb/bit_manipulation.py", line 112, in lsb_deinterleave_list
deinterleaved = lsb_deinterleave_bytes(carrier_bytes, num_bits, num_lsb)
File "/usr/local/lib/python3.6/dist-packages/stego_lsb-1.1-py3.6.egg/stego_lsb/bit_manipulation.py", line 84, in lsb_deinterleave_bytes
np.frombuffer(carrier, dtype=carrier_dtype, count=plen).view(np.uint8)
ValueError: buffer is smaller than requested size
Do you know what causes this or what I'm doing wrong?
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