klempotres

But the claim is that Apple does that "on device". To the best of my understanding, this would mean that both parties in the PSI protocol are "on the same device". Do they probably use some kind of TEE (Trusted Execution Environment) to evaluate the "other side" of the PSI protocol?

Technically speaking, if Apple plans to perform PSI on device (as opposed to what Microsoft does), how come that "the device will not know whether a match has been found"?

Is there anyone who's familiar with the technology so they can explain how it works?

Because it is crucial in practice, right?

So is the caste system of India. It is in books, it is in public transportation, it is in job market, it is in kitchen, it is schools. To have formal statistics, you first need to acknowledge that the issue exists and then to investigate it. By the same token, the absence of the formal statistics does not disprove discrimination, quite the opposite, it proves that the systematic discrimination is not yet recognized as a problem. Which is systematic discrimination "by definition".