Woah how about this then, PSFK reveals that Apple have filed a patent which uses special heartbeat sensors for the iPhone.

It states that the technology could measure the unique signal of the users heartbeat to unlock the handset. The pulse would be measured via the touchscreen, detecting the patterns and matching it to a pre-recored hearbeat in the phone’s memory.

This functionality could be available to developers to create pretty amazing applications off the back of it, such as financial institutions using it for authentication.