"To make this process easier, Apple introduced Contact Key Verification, found under Settings and Apple ID, which displays a verification code that you and your iMessage contacts can compare. If the codes line up, you can tap Mark As Verified, which saves the code to that person's contact card. 'When you manually verify a contact, iMessage Contact Key Verification verifies that the code you have saved matches the one provided by the iMessage servers for that contact and notifies you if the verification code changes,'"
"Apple has a little-known security feature, often described as a hidden 'secret code,' that can reveal if someone is snooping on your private conversations. Every iMessage chat generates a unique security code, like a digital fingerprint. If you and your contact see the same code, your messages are safe and fully encrypted. However, if the codes don't match, it could mean your texts are being intercepted, or more innocently, that your contact recently changed phones or reinstalled the app."
Each iMessage conversation generates a unique security code that functions like a digital fingerprint. Matching codes between participants confirm that messages remain end-to-end encrypted and secure. Non-matching codes can indicate interception or benign causes such as a contact changing phones or reinstalling the app. Contact Key Verification appears under Settings and Apple ID and displays a verification code that contacts can compare. Users can tap Mark As Verified to save codes to contact cards. Manual verification can be done in Conversation Details or by sharing a Public Verification Code. Verification notifies users if a contact's code changes.
Read at Mail Online
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