Security alerts in Messenger end-to-end encrypted chats

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Security alerts are notifications in Messenger that tell you about:
  • Logins on a new device. These alerts appear in your Messenger settings for your logins and in your chat for your contact's logins.
  • Key changes. These alerts appear in your Messenger settings for your key changes and in your chat for your contact's key changes.
Not all key changes mean something's wrong. For example, a new key can show up when someone reinstalls the Messenger app on their device. Keys also change when someone:
  • Uninstalls the app.
  • Resets their phone.
  • Clears their app data.
You can turn on and manage your security alerts in Messenger on a mobile device.
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