Comment by O__________O

By control, I mean, create, replace, destroy, etc — I would never create keys based on “identity and a random nonce” selected by a third-party.

Also, since you brought it up, appears Ed25519 vulnerability has been reported:

https://www.google.com/search?q=Ed25519+exploit

Also, are these HomeKit “keys” in iCloud backups unencrypted? Meaning that the HomeKit data is encrypted, but the keys are not; to be clear, not saying they are, asking if they are.