Security analysis of Apple's iMessage PQ3 protocol

February 21, 2024 at 09:00AM     Research

Today Apple announced its new iMessage PQ3 protocol, which is an update to the cryptographic protocol used in iMessage that adds post-quantum cryptography. I worked with Apple over the past few months to analyze the protocol and show that it meets the security goals, and have written a paper describing my findings. I’m glad to see the adoption of post-quantum cryptography protocols continuing.