It terms of authentication we have: * Things you know * Things you have (physically) * Things you are We have abstracted a thing we know, passwords, to be m

It terms of authentication we have: * Things you know * Things you have (physically) * Things you are We have abstracted a thing we know, passwords, to be managed. The alternative could be multiple things we have and things we are. So a combination of: * physical objects, such as keys, smart phones, smart cards, USB drives, and token devices. * fingerprint scanning, palm scanning, facial recognition, retina scans, iris scans, and voice verification, etc.