A team of physicists at Lancaster University in the UK have built up almost unbreakable encryption scheme inspired by the time-varying nature of the cardiorespiratory coupling in humans. The way our heart and lungs interact with each other is a paradigm of “coupling functions” The two ends of encryption are the sender and the receiver, just like our hearts and lungs. The coupling functions send and receive multiple encrypted signals at the same time, generating a limitless number of possibilities for the shared encryption key.
Source: https://thehackernews.com/2014/04/unbreakable-encryption-inspired-by.html