I guess this isn't conventional hacking; it's infosec and it's computer based, but involves scanned redacted documents.
The documents I have were FOIA'ed by someone else more than two decades ago and have been online since then. I have trouble believing I'm the first to have spotted this mistake but some searching returned no hits.
What has happened is the redactor has cut out little squares of paper to place over the redacted sections of the document and then scanned it. What they were supposed to then do was fiddle with the contrast to make sure nothing bleeds through (i.e. make light greys white and dark greys blacker). Historically this would be done with a photocopier but I assume around this time they may have been switching to digital someone made mistake because only a quarter of the pages part way through are like this.
I noticed this mistake last night while looking through a pile of FOIA'ed documents from someone else's online archive and have tried in GIMP to fiddle with the contrast to make things stand out to some partial success. I know very little about image processing though so I was hoping someone might be able to point me towards some better tools or better technique.
The document includes both images and text.
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from hacking: security in practice https://ift.tt/3fwFwNC
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