New System with End-to-End Encryption
WhatsApp new update of bringing the WhatsApp account on multiple devices are made possible with End-to-End encryption. WhatsApp has developing a new method to assign keys for specific devices. Presently, WhatsApp will create the security keys between the two users who starts the chatting session. In the same vein, in addition, WhatsApp implementing the specific keys between the devices if the same account used.
Know more about the WhatsApp Account on Multiple devices here