Un-Redactor

25•kvthweatt•3h ago

Comments

Waterluvian•2h ago

Are there tools for trying to predict possible fits for redacted data given font, black bar size, and context?

jmward01•1h ago

I was thinking something similar. I wonder if the font uses kerning, and you know the rendering engine and the algorithm for how the text was blocked, if you can get exact text back even. Or, at a minimum, rule out words based on the available information. Not a field I am familiar with but I bet there are a lot of ways to uncover the redacted values.

amarant•1h ago

I don't know what fonts are typically used in redacted documents, but surely this kind of technique could be rendered useless by a mono space font?

Seems silly not to use a mono space font in these cases.

sa46•1h ago

Wouldn’t a mono space font provide more information since you can extrapolate the exact number of characters?

jstanley•59m ago

My guess is that is actually less information than you get from a variable width font.

kvthweatt•54m ago

Either way, fixed or with index lines.

estimator7292•1h ago

https://libraryofbabel.info/

DavidSJ•1h ago

In some redacted documents, there is even an alphabetical word index at the end with a list of pages on which the words appear.

The redacted words are also redacted in the word index, but the alphabetically preceding and succeeding words are visible, as is the number of index lines taken up by the redacted word's entry, which correlates with the number of appearances of that word.

This seems like rather useful information to constrain a search by such a tool.

kvthweatt•54m ago

Yes.

mapontosevenths•1h ago

Does it even matter? The kind of people who see stuff like this and are still fine with it are likely fine with anything else thats discovered as well.

The truth has become irrelevant.

https://www.justice.gov/epstein/files/DataSet%208/EFTA000250...

kvthweatt•51m ago

This just attempts to match box dimensions.

dylan604•37m ago

i'm sure people will ask chatGPT to do this very thing, so it's a good thing LLMs never make shit up

8note•1h ago

> Republishing altered documents is illegal

what exactly does this mean? misrepresenting the altered document as unaltered?

i cant imagine it being illegal to do madlibs

kvthweatt•52m ago

That's the point though. You cannot just write anything and put it up.

It must be accurate. Even that being said, you still shouldn't reupload your altered document anywhere.

cess11•44m ago

Why not? In some cases it might amount to fraud or something, but in general, why would it be prohibited?

dylan604•41m ago

this tool coming out on the heels of the DOJ releasing a trove of redacted documents doesn't come across as coincidental to me. let's think about this for a bit longer from that idea of using this on legal evidence...why would doctoring a legal document be prohibited?

kvthweatt•37m ago

You do you but I advise you don't.

Standard CYA procedure

For all we know, Epstein could have punished Trump and made him write "I'm a little bitch boy" 2,000 times and it took up 119 pages so every line got redacted. /madlibs

circuit10•7m ago

I guess you mean offical legal documents or something, but your sentence doesn't say that or mention those so it comes across in a very confusing way (it implies that using Word is illegal because every time you type something you alter your document)

typeofhuman•1h ago

> lets you put your own information over a redaction box.

This doesn't remove redactions, it lets you write over them.

websiteapi•1h ago

why unredact, rather than just edit the pdf to remove the redaction box and insert whatever you want? presumably you'd want a viewer to see that you modified a redaction, but why?

speedgoose•1h ago

From a previous post of the author, I guess the motivation is to write back the text on top on the black boxes.

dylan604•39m ago

anyone using PDF features to redact are just not doing it right

kvthweatt•55m ago

The point is you can perform a box dimension attack.

If you have a known input, you can match all outputs.

Example: Document that DOJ took down and reuploaded that redacted Trump's name when it was previously available. They used the same size boxes in each location.

You cannot do this with handwriting, but fonts have known widths.

cortesoft•42m ago

Couldn’t it be the same letters in a different order?

dylan604•39m ago

depending on the font used, the spacing between letters can change depending on what letters are next to each other.

fn-mote•33m ago

A probabilistic attack on redaction is still an attack.

You'd never be blase about the same information about your password.

Plus with redaction there's a pretty small number of posible words when the boxes are small.

jaredwiener•49m ago

Free Law Project also has this open source tool to detect bad redactions: https://github.com/freelawproject/x-ray

yellow_lead•36m ago

With regards to the Epstein files, it seems some files are not redacted well.

For instance, this file says Mona if you remove the top layer https://www.justice.gov/epstein/files/DataSet%208/EFTA000136...

Some others I've seen include 1-3 more letters than are in the redaction.

brikym•19m ago

You should really put some usage instructions on the README.

    uv run --with PyMuPDF --with pillow ./unredactor-main/unredact.py

I tried a couple PDFs but get "Failed to open PDF: bad argument type for built-in operation".

Redactle.net has something similar where you can double-click or tap-hold then type a note over the redacted word.

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