Apple Enhances iMessage Security Against Quantum Computing Threat
Via TechCrunch
Summary
Apple announced in February 2024 that it would upgrade iMessage's encryption protocol to defend against future quantum computing attacks, introducing a new system called PQ3. The protocol combines Kyber, a post-quantum cryptographic algorithm, with existing elliptic curve cryptography to achieve what Apple described as "Level 3" security — the highest claimed by any messaging platform at the time.
The upgrade was designed to counter "harvest now, decrypt later" attacks, in which adversaries collect encrypted messages today with the intent of decrypting them once quantum computers become powerful enough. While large-scale quantum computers capable of breaking modern encryption do not yet exist, intelligence agencies consider the threat credible enough to warrant preemptive action. Apple's move placed iMessage among the most quantum-resistant consumer messaging platforms in the world.
