WhatsApp will add support for encrypted message backups

Users will also have the option of creating a password for their old messages. In that case, the randomly generated key is stored in a Backup Key Vault with a hardware security module (HSM). Once the messages are stored, users can then type in their password to the Backup Key Vault to get their encrypted key and unlock the old messages from storage. The key will become inaccessible once a certain number of unsuccessful password attempts are made.

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