PrivateDrop: Breaking and Fixing Apple AirDrop (2021)

Seeing that there's recent reports about the Chinese government "cracking" AirDrop[1], I figured it's worth bringing to light that their efforts are not new work, but merely the piggybacking upon prior research into a large AirDrop privacy hole[2].

Even Apple states that AirDrop uses phone and email hashes in their own docs. [3]

[1] https://www.bloomberg.com/news/articles/2024-01-09/china-say... / https://archive.is/XnvO8

[2] https://www.macrumors.com/2021/04/23/airdrop-researchers-sec...

[3] https://support.apple.com/guide/security/airdrop-security-se...