this post was submitted on 28 Aug 2023
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Imagine if you were the owner of a really large computer with CSAM in it. And there is in fact no good way to prevent creeps from putting more into it. And when police come to have a look at your CSAM, you are liable for legal bullshit. Now imagine you had dependents. You would also be well past the point of being respectful.
On that note, the captain db0 has raised an issue on the github repository of LemmyNet, requesting essentially the ability to add middleware that checks the nature of uploaded images (issue #3920 if anyone wants to check). Point being, the ball is squarely in their court now.
I think the FBI or eqivilant keeps a record of hashes for a known CASM and middleware should be able to compare to that. Hopefully, if a match is found, kill the post and forward all info on to LE.
Interesting. But aren’t hashes unique to a specific photo? Just a single change to the photo would inevitably change its hash.
I think Apple was going to implement a similar system and deploy to all iPhones/Macs in some iOS/macOS update. However was eventually 86’d due to privacy concerns from many people and the possible for abuse and/or false positives.
A system like this might work on a small scale though as part of moderating tools. Not sure where you would get a constantly updated database of CSAM hashes though.
Most people are lazy and stupid, so maybe hash checking is enough to catch a huge portion (probably more than 50%, maybe even 80% or 90%?) of the CSAM that doesn't bother (or know how) to do that?
I'm almost positive they've been developing an image recognition AI that will make slightly altering csam photos obsolete.
Here's hoping.
A hash would change if even one bit changed in that file. This could be from corruption, automated resizing by any photo processing tools (i.e., most sites will resize photos if you give them one too big), saving a lossy file time again (adding more jpg), etc.. This is why there aren’t many automated tools for this detection. Sites that have tried by using skin tones in a photo have failed spectacularly.
I’ve never heard of this FBI middleware. Does anyone have the link to this? I’d like to understand what tools are available to combat this as I’ve been considering starting my own instance for some time now.
In my utopia world, the FBI has a team updating the DB.
The utopia algorithim would do multiple subsets of the picture so cropping or watermarking wouldn't break the test (assume the 'crux' of the CSAM would be most likely unaltered?) , maybe handle simple image transformations (color, tint, gamma, etc.) with a formula.
What you're talking about is digital (aka forensic) watermarking.
IMO scanning images before posting them to a forum is a distinct and utterly completely different world than having your photo collection scanned. Especially in context and scale
You can already protect your instance using CloudFlare’s CSAM protection, and sorry to say it, but I would not use db0’s solution. It is more likely to get you in trouble than help you out. I posted about it in their initial thread, but they are not warning people about actual legal requirements that are required in many places and their script can get you put in jail (yes, put in jail for deleting CSAM).
The developers of LemmyNet are being asked for the ability to define a subroutine by which uploaded images are to be preprocessed and denied or passed thereafter. There is no such feature right now. Even if they wanted to use CloudFlare CSAM protection, they couldn't. That's the entire problem. This preprocessing routine could use Microsoft PhotoDNA and Google CSAI, it could use a self-hosted alternative as db0 desires or it could even be your own custom solution that doesn't destroy, but stores CSAM on a computer you own and stops it from being posted.
? CF’s solution happens at the DNS level. It has absolutely nothing to do with lemmy and there’s nothing the devs could do to change that.
Yeah I just looked it up. Serving stuff through CF does a check for illicit material. Pretty neat. Be that as it may, the original complaint is that Lemmy is lacking moderation tools. Such a moderation tool would be something that disallows CSAM even being stored in the server in the first place.