Related. Others?
iMessage with PQ3 Cryptographic Protocol - https://news.ycombinator.com/item?id=39453660 - Feb 2024 (267 comments)
All that security, and then by default Apple literally just sends themselves a copy of your encryption keys to store in iCloud backup, the only cloud backup solution Apple allows you to use. "to help you recover your data" [1] (oh and also to send law enforcement your message history in plaintext on request, but we don't talk about that).
[1] https://support.apple.com/en-us/102651#:~:text=in%20iCloud%2...
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This is a revision of a paper that first appeared as an eprint back in September when PQ3 was announced.
https://eprint.iacr.org/2024/1395