It goes without saying that anyone that has been involved with any solid password encryption system, aside from my brother and the other individuals out there with a keen photographic memory, has written or typed those passwords down in a place to pull up and look at when time to use them. With multiple login accounts, all requiring a password change every 30 days or so, one would be hard pressed to remember something along the lines of HF&*78ls#@… or 5 variations of that for 5 separate, work related uses.
To that end, DARPA is looking into a password that unlocks what is locked via recognition of your typing style versus an actual password string. Sounds great for the sober office setting. Not so great for you late night drinkers looking to do a little drunk emailing with fumbling fingers.