Apple is overhauling the cryptographic security of iMessage by introducing a new messaging protocol to thwart advanced computing that has yet to become a feasible threat, and probably won't for years.
Apple has announced a significant cryptographic security upgrade to iMessage that introduces PQ3, a post-quantum cryptographic protocol that reaches Level 3 security.
Useful quantum computers aren’t a reality yet. But in one of the biggest deployments of post-quantum encryption so far, Apple is bringing the technology to iMessage.