The uniqueness our your heartbeat could provide the encryption needed to unlock your various devices. A scientific team has successfully translated a human heartbeat into an encryption key. Each person has a unique heartbeat and it also never repeats its pattern so you would never get the same encryption key twice.
The goal is to integrate the system into hardware so that users can both encrypt and decrypt their devices with the touch of their hand.
The research was conducted by Chun-Liang Lin at the National Chung Hsing University in Taichung, Taiwan.