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The revamped iMessage app uses Apple's new PQ3 post-quantum cryptographic protocol, which its engineers say will make it the most secure messaging app — but Signal's president begs to differ.
Apple has announced a significant cryptographic security upgrade to iMessage that introduces PQ3, a post-quantum cryptographic protocol that reaches Level 3 security.
We are introducing PQ3, a groundbreaking cryptographic protocol for iMessage that advances the state of the art of end-to-end secure messaging. With compromise-resilient encryption and extensive defenses against even highly sophisticated quantum attacks, PQ3 provides protocol protections that surpass those in all other widely deployed messaging apps.
Damien Desfontaines' PhD thesis, in HTML format