On the one hand, this can sound crazy and too fictitious to be true, especially since it’s been a staple for just about every single sci-fi movie and TV show ever. On the other, we’ve basically already accepted the use of our bodies as sources of information and security. A company called Eyelock is working on just the technology we’ve gotten used to seeing in film. They’ve even got a handful of products — specs, prices and all — ready to go into production.

Soon enough, your eyes won’t be your only means of bodily verification. Ingestible pills which communicate with your smartphone, reporting on your daily health, are already a reality. Companies like Proteus Digital Health would only have to fine tune the devices to display a certain bit of your internal health when prompted, and presto: you’ve got a very unique bodily-generated password.