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> Do you really want a false positive to result in your intimate moments getting shared around some outsourced boiler room for laughs? these people also have no incentive to find you innocent for innocent photos. If they err on the side of false-negative, they might find themselves at the wrong end of a criminal search ("why didn't you catch this"), but if they false-positive they at worse ruin a random person's life…
Even still this has to go to the FBI or other law enforcement agency, then it’s passed on to a prosecutor and finally a jury will evaluate. I have a tough time believing that false positives would slip through that many layers. That isn’t to say CASM scanning or any other type of drag net is OK. But I’m not concerned about a perceptual hash ruining someone’s life, just like I’m not concerned about a botched millimete…
I want ZERO computerized algorithms involved in any law enforcement process - especially the "criminal hunting" steps.
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Rookie mistake. Three rules to live by: 1) Always pay your taxes 2) Don’t talk to the police 3) Don’t take photographs with your clothes off
I might amend #2 a bit to read "Be friends with the police" as that has historically been more beneficial to those who are.
Counterargument, why you should not talk to the police (In the US): https://youtu.be/d-7o9xYp7eE
> an Apple employee will then look at your (flagged) pictures. This means that there will be people paid to look at child pornography and probably a lot of private nude pictures as well.
And what do you think the content moderation teams employed by Facebook, YouTube, et al. do all day?
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And what do you think the content moderation teams employed by Facebook, YouTube, et al. do all day?
They look at content that people actively and explicitly chose to share with wider audiences.
I've also implemented perceptual hashing algorithms for use in the real world. Article is correct, there really is no way to eliminate false positives while still catching minor changes (say, resizing, cropping, or watermarking). I'm sure I'm not the only person with naked pictures of my wife. Do you really want a false positive to result in your intimate moments getting shared around some outsourced boiler room for…
> Do you really want a false positive to result in your intimate moments getting shared around some outsourced boiler room for laughs? these people also have no incentive to find you innocent for innocent photos. If they err on the side of false-negative, they might find themselves at the wrong end of a criminal search ("why didn't you catch this"), but if they false-positive they at worse ruin a random person's life…
Given all the zero day exploits on iOS I wonder if it's now going to be viable to hack someone's phone and upload child porn to their account. Apple with happily flag the photos and then, likely, get those people arrested. Now they have to, in practice, prove they were hacked which might be impossible. Will either ruin their reputation or put them in jail for a long time. Given past witch hunts it could be decades be…
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> Do you really want a false positive to result in your intimate moments getting shared around some outsourced boiler room for laughs? these people also have no incentive to find you innocent for innocent photos. If they err on the side of false-negative, they might find themselves at the wrong end of a criminal search ("why didn't you catch this"), but if they false-positive they at worse ruin a random person's life…
Does claiming a false positive not run the risk of libel?
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So what are we going to do about it? I have a large user base on iOS. Considering a blackout protest.
IMHO, Unless everything being E2E encrypted becomes the law we can’t do anything about it because that’s not Apple’s initiative but comes from people whose job is to know things and they cannot resist keeping their hands out of these data collecting devices. They promise politicians that all the troubles will go away if we do that. Child pornography, Terrorism? Solve it the old way. I don’t know why citizens are obli…
Public and political pressure is definitely an issue - but it's still soft-pressure so applying more pressure in the other direction will be compelling to Apple.
I agree with the article in general except part of the final conclusion > The simple fact that image data is reduced to a small number of bits leads to collisions and therefore false positives Our experience with regular hashes suggests this is not the underlying problem. SHA256 hashes have 256 bits and still there are no known collisions, even with people deliberately trying to find them. SHA-1 only has only 160 bit…
These algos work by limiting the color space of the photo, usually to only black and white (not even grey scale) resizing it to a fraction of its original size and then chopping it into tiles using a fixed size grid.
This increases the chances of collisions greatly because photos with a similar composition are likely to match on a sufficient number of tiles to flag the photo as a match.
This is why the women image was matched to the butterfly image, if you turn the image to B&W resize it to something like 256x256 pixels and divide it into a grid of say 16 tiles all of a sudden a lot of these tiles can match.