Due to the daily usage of these applications and the wide information that can be deduced from the sensors, a lot of private and sensitive information can be leaked unless access control is applied to the installed applications. The main reasons for their wide adoption can be considered the introduction of various sensors that have completely reshaped user interaction standards as well as the development of myriads of applications that provide various services to the users. Billions of hand-held devices are used globally in daily basis.
