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Security Code Change Notification

End-to-end encrypted chats between you and one other person have their own security code used to verify that the calls and the messages you send to that chat are end-to-end encrypted. This code can be found in the contact info screen, both as a QR code and a 60-digit number. These codes are unique to each chat and can be compared between people in each chat to verify that the messages you send to the chat are end-to-end encrypted. Security codes are just visible versions of the special key shared between you - and don't worry, it's not the actual key itself, that's always kept secret.

At times, the security codes used in end-to-end encryption might change. This can happen because you or your contact reinstalled WhatsApp or changed phones.

To receive notifications when security codes change:

  1. Open WhatsApp Settings.
  2. Tap Account > Security.
  3. From here, you can enable security notifications by tapping Show Security Notifications.

Note: This feature is only available for a contact in an end-to-end encrypted chat.

You can always verify that a contact's security code is legitimate. Learn how in this article on end-to-end encryption.

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