Advanced Data Protection does nothing to iMessage transit, it only affects the Messages in iCloud backups from your own devices. If both you and the remote party have ADP enabled then any backups of iMessages from those devices will be protected more strongly than they would be without ADP.
What you may also be looking for is a separate feature called Contact Key Verification, which allows you to prove you are talking to who you think you are talking to.
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u/nate390 1d ago
Advanced Data Protection does nothing to iMessage transit, it only affects the Messages in iCloud backups from your own devices. If both you and the remote party have ADP enabled then any backups of iMessages from those devices will be protected more strongly than they would be without ADP.
What you may also be looking for is a separate feature called Contact Key Verification, which allows you to prove you are talking to who you think you are talking to.