Apple Launches PQ3 Post-Quantum Cryptography for iMessage

On May 23, 2026, Apple announced the introduction of PQ3, a post-quantum cryptographic protocol for iMessage, marking a significant upgrade in secure messaging. This protocol aims to protect users against potential future quantum computing threats, providing Level 3 security with advanced encryption methods. The update includes a GitHub release of corecrypto source code, which supports encryption, hashing, and digital signatures across Apple devices. Apple has implemented ML-KEM and ML-DSA algorithms, verified against NIST standards, to enhance security. The move addresses the 'Harvest Now, Decrypt Later' attack scenario, where attackers could store encrypted data for future decryption once quantum computers become available. This initiative is part of Apple's ongoing commitment to improving user security in the face of evolving technological threats.

Key Points: • Apple introduced PQ3, a post-quantum cryptographic protocol for iMessage. • The protocol provides Level 3 security, surpassing existing messaging app protections. • Apple released corecrypto source code on GitHub to promote transparency and community review.