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this post was submitted on 14 Oct 2023
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Privacy
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The way I intend client-side is that ideally the client would have the CP hashes built in and would only trigger on a hash match, that is, when it’s 100% sure that your picture is ID’d.
The problem I have is that if it’s server side it’s indeed a horrible privacy violation, if it’s client side it’s trivial to bypass through some decompiled version of the app - so there is no good way to sell this.
We’re splitting hairs here, I agree with you generally speaking.
Yes. But the government can provide an "updated" hash database. Such updates would be frequent. There is no way for whatsapp to know what files were used to make those updated hashes. Unless the government distributes copies of the underlying CSAM to the messenger app providers which kinda goes against supposedly trying to stop the proliferation of CSAM in the first place.