"At times, the security codes used in end-to-end encrypted chats between you and one other person might change," WhatsApp explained. "This is likely because you or your contact reinstalled ...

While WhatsApp scrambles ... from the main security menu: a small green toggle, which when flicked to 'on', will ping a message to your phone any time a contact's security code has changed.

If someone tricks you into revealing this code, they can gain full access to your WhatsApp account. This allows them to send ...

before scanning a QR code from the phone to link your device. The new security update for linking devices will be rolling out, alongside a visual redesign to the WhatsApp Web page on phones ...