Apple has added support for physical security keys and expanded encryption to the new iPhone iOS 16.3 update, but they’re not for everyone.
How to use Advanced Data Protection & Apple's other new security features
Big security upgrade for iCloud
Apple's Advanced Data Protection Gives You More Keys to iCloud Data - TidBITS
Apple's New Data Protection, Contact Key Verification, and
Strengthening security on my Apple account!
Should iPhone users use security keys and Advanced Data Protection? - The Washington Post
How Apple's Advanced Data Protection Works, and How to Enable It on Your iPhone
Apple's Advanced Data Protection Gives You More Keys to iCloud
Should You Enable Advanced Data Protection for iCloud on iPhone?
Use security keys to sign in to your Apple ID account on iPhone - Apple Support
Apple lays out new Apple ID and iMessage Security features for 2023
Cloud Security and Data Protection Services