(Not an iMessage user) Does iMessage actually have a way to display the raw public key(s) locally associated with a contact and your public key(s)? Wondering if you can verify keys out of band or if you have to trust Apple to be the authority.
It's not surfaced in the UI but, as far as I recall, the information does actually reach the device already. Here's a paper [1] which dives into the cryptography used in iMessage (at least whatever was used at time of publication).
