[puzzle]

Niels Provos himself is a Chromebook user (not sure if he needs to access production these days...) and he talks about locking down privileged access to Chromebooks with security keys:

https://mikecborg.wordpress.com/2017/03/22/securing-clouds/ (search for all occurrences of 'chromebook')

https://youtu.be/O-JXFQezWOc?t=35m0s