Here's a great one from Pico project: http://www.cl.cam.ac.uk/~fms27/papers/2012-BonneauHerOorSta-password--oakland.pdf http://www.cl.cam.ac.uk/~fms27/papers/2

Here's a great one from Pico project: http://www.cl.cam.ac.uk/~fms27/papers/2012-BonneauHerOorSta-password--oakland.pdf http://www.cl.cam.ac.uk/~fms27/papers/2012-BonneauHerOorSta-... Other publications that might interest you: http://pico.cl.cam.ac.uk/technical/ http://pico.cl.cam.ac.uk/technical/ Ross Anderson's blog, LightBlueTouchpaper, has writeups on this in authentication category.