Regina Dugan - former DARPA director currently google executive.

Want you to swallow the identification microchip. She explain how the microchip work when it is in the body, inside the pill is a small chip with switch. When you swallow the pill,the acid in your stomach act as an electrolyte that powers the chip. The switch turns on and off and generates 18-bit ECG signal in your body so that your whole body become your authenticator. "You put your hand to your computer,your phone,your doorbell-and your authenticated". The video was film in 2012 so you can imagine the technology already exist.