3 ms·
Apple claimed 'one in a trillion' chance of a collision. This is a great example of why you should not trust such an assessment.
by avsteele 5y ago
Apple claimed 'one in a trillion' chance of a collision. This is a great example of why you should not trust such an assessment.
- arsome 5y agoTo be fair, log_2(1 trillion) is only about 40 bits.
- manmal 5y agoThat number is based around their plan to only trigger a search if a certain number of CSAM hashes were detected on a phone. A single collision wouldn't trigger such a search. A sufficiently motivated person can of course get access to a phone and put plenty hash-colliding images in the library.
- cyanite 5y agoThat’s a different scenario. That’s for it happening by chance, not on purpose. At any rate, the “matching” images are reviewed (or a “visual derivative” is).