1. A computing device comprising: one or more processors; a memory coupled with the one or more processors; a login module operated by the one or more processors to authenticate a first user of the device and establish a first access control state corresponding to a first user profile associated with the first user; a contextual authentication module operated by the one or more processors to select a second user profile based at least in part on a changed user characteristic; and a presentation module operated by the one or more processors to present a resource based at least in part on the second user profile.