The AirDrop flaw exploited by China, explained
The AirDrop flaw exploited by China, explained

blog.cryptographyengineering.com
Attack of the week: Airdrop tracing

The news was already posted here last week, but I found this great technical explanation of the flaw. Long story short: Apple is using bad cryptography. They got alerted by researchers back in 2019 but didn't fix it.