Protection against quantum computers is one of the significant security updates for iMessage that Apple has disclosed. Why iMessage quantum security matters, how to enable it on your iPhone, iPad, Mac, and Apple Watch, and other details.

Apple has unveiled PQ3, the “most significant” cryptographic update for iMessage, ahead to iOS 17.4 becoming available to all users. The iOS 17.4 beta for iPhone already has the new iMessage quantum security.

How to turn on quantum security for iMessage

1. Install the iOS 17.4 beta on your iPhone using this comprehensive guide:
To update your iPad, Mac, and Apple Watch, install the beta versions of iPadOS 17.4, macOS 14.4, and watchOS 10.4.
2. Over time, PQ3 (quantum protection) will be automatically added to your iMessage.
3. Or you may wait until early March, when iOS 17.4 is made available to the general public.

How much time does it take to upgrade iMessage?

• According to Apple, iMessage chats will automatically “ramp up” to the post-quantum encryption technique. Additionally, iOS 17.4 must be installed on both sides of the discussion for this to happen.
• According to Apple, “all supported conversations this year will fully replace the existing protocol within the PQ3 iMessage quantum security upgrade.”

Why does PQ3 matter now?

It is critical to stay ahead of upcoming quantum computer-based threats. One of the current risks is the “Harvest Now, Decrypt Later” strategy. Threat actors take data now and gain access to it when more potent machines become available later on to break current encryption. PQ3 (iMessage quantum security) offers further protection against this vulnerability.