  Security models have been designed to ensure data is accessed and used in
proper manner according to the security policies. Unfortunately, human role in
designing security models has been ignored. Human behavior relates to many
security breaches and plays a significant part in many security situations.In
this paper, we study users' security decision making toward security and
usability through the mental model approach. To elicit and depict users'
security and usability mental models, crowd sourcing techniques and cognitive
map method are applied and we have performed an experiment to evaluate our
findings using Amazon MTurk.
