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by lxgr 449 days ago
How would an open implementation be compatible with this, given that Apple's implementation is based on an Apple-operated PKI?

Note that this is only a conversation about sender identification, which allows sending to a "non-world-visible" receiving device and confirmation-less sending to devices with the same iCloud account on them. Anonymous sending isn't cryptographically gated by Apple, to my knowledge.
1 comments
ryao 449 days ago
Their documentation suggests that is only needed by contacts only mode and they wrote some code to get the needed certificates from macOS:

https://github.com/seemoo-lab/airdrop-keychain-extractor

link
lxgr 449 days ago
That still requires you to have (access to) a Mac and an iCloud account.

It might be possible to reimplement the required Apple API, but as demonstrated by the iMessage/Beeper saga, they usually shut such things down pretty quickly.

link