Messaging service WhatsApp is launching passkey-encrypted chat backups for iOS and Android, allowing users to encrypt their stored message history using their face, fingerprint, or device screen-lock code. Backups have long been a weak link in messaging-security. Even if chats and calls are encrypted in transit, stored backups may rely on a password or key that users must remember or manage. By adding passkey-encryption for backups, WhatsApp shifts more of the security burden onto the … More
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