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To everyone asking why they need a human to review to image before hashing it: it's currently the only way to prevent abuse of this system -- Without this, everyone would upload random images that would get taken down, effectively mass-trolling
https://twitter.com/alexstamos/status/928646228472078336
(You'd reverse engineer the algorithm and permanently defeat it - rendering all fingerprints stored useless)
The better solution is to have the image hashed and NOT sent to facebook. If the hash matches an existing image [A]. If the hash isn't found [B]. [A]: human can review the image they already have [B]: Facebook waits until someone uploads an image that matches and then reviews the image (as normal) but with a marker alerting the problem. The benefit is that people NOT affected won't have to upload lots of images of th…
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While this (client-side hashing) would be better in terms of privacy protection for this specific case it is not going to happen because Facebook is not allowed to perform the specific photo hashing client-side as this would expose the hashing mechanism to analysis.
maybe they shouldn't ask for nudes until they have designed an open source algorithm?
There would be a browser extension to "refingerprint" images within 24 hours of release.
The discussion surrounding this made me think of a feature I'd love to have along these lines. I'd like to be able to blacklist people / certain people from uploading pictures that facebook detects my face in. Fb as a platform must already have this functionality, what with the auto face identification and privacy / review post settings. I can imagine images of people that aren't "non-consensual intimate images" that…
> I can imagine images of people that aren't "non-consensual intimate images" that they'd reasonably still like to be able to block being posted. If I take a photo of a public landscape and you happen to be there, do you have the right to prevent me from publishing it unaltered? Keep in mind: you're not the primary subject (and no reasonable person would believe that you were) nor owner of the photo. Your likeness is…
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PhotoDNA would be an option, I imagine. Or at least something similar! https://en.wikipedia.org/wiki/PhotoDNA
Honestly, I doubt that most of these sorts of algorithms would survive concerted attacks – that's why they tend to be closely guarded. Alex Stamos (Facebook's CISO) implies this is why they can't do it client-side: https://twitter.com/alexstamos/status/928646228472078336
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This clearly implicates that Facebook has, almost without reserve, the ability to read messages from user to user (even though it might limited to messages to oneself), and exposes that ability to its employees. You can view and search your message history on Facebook, so there is not really any question that they have and can read all messages. I never explicitly checked it but at least I never noticed any gaps, i.e…
Using Messenger you can start a secret conversation with someone which is encrypted end-to-end. Those conversations only exist in the current device. But regular conversations are not encrypted in any way.
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> I can imagine images of people that aren't "non-consensual intimate images" that they'd reasonably still like to be able to block being posted. If I take a photo of a public landscape and you happen to be there, do you have the right to prevent me from publishing it unaltered? Keep in mind: you're not the primary subject (and no reasonable person would believe that you were) nor owner of the photo. Your likeness is…
Excellent! Then it should be short work for you to photoshop my face out so it won't be blocked. Everybody wins.
It’s interesting that the general consensus is strangers seeing your nudes is creepy (referring to the manual processing aspect.) I understand it on a fundamentally emotional level: I want absolute control of my private life / photos / etc. I am embarrassed at the idea of being seen naked without my active participation. On a logical level, though, what difference does it make if every person you will never meet has…
What's really bizarre to me is that people here don't think using facebook in general is creepy...
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maybe they shouldn't ask for nudes until they have designed an open source algorithm?
How would an open source fingerprinting algorithm work in this case? There would be a browser extension to "refingerprint" images within 24 hours of release.
That's how we got good crypto. By not keeping it proprietary.
And a side benefit that we would get some amazingly alteration-resistant perceptual image hashes out of that.
The better solution is to have the image hashed and NOT sent to facebook. If the hash matches an existing image [A]. If the hash isn't found [B]. [A]: human can review the image they already have [B]: Facebook waits until someone uploads an image that matches and then reviews the image (as normal) but with a marker alerting the problem. The benefit is that people NOT affected won't have to upload lots of images of th…