Depixelating information in the document (finding what was not supposed to be found)
In short
While playing the GreenHorn box on Hack The Box, I encountered a situation where a PDF contained a pixelated password
https://www.hackthebox.com/achievement/machine/409699/617
Upon deeper investigation, I found ways to depixelate the image
with
https://github.com/spipm/Depix
the result
potential password
sidefromsidetheothersidesidefromsidetheothersideDiving deeper
I will dive deeper into how it works another day
Today, I'll focus on how to depixelate the image
I extracted the image from the PDF. (Note: Do not take a screenshot! Always extract the image directly from the PDF to preserve quality.)
I initially made the mistake of thinking it would be fine to use a screenshot.
As a result, Depix was unable to depixelate the image
After I passed it to Depix
python3 depix.py -p pix.png -s ./images/searchimages/debruinseq_notepad_Windows10_closeAndSpaced.png -o output.pngthe result from
to
References
https://github.com/spipm/Depix
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