  Application markets provide a communication channel between app developers
and their end-users in form of app reviews, which allow users to provide
feedback about the apps. Although security and privacy in mobile apps are one
of the biggest issues, it is unclear how much people are aware of these or
discuss them in reviews.
  In this study, we explore the privacy and security concerns of users using
reviews in the Google Play Store. For this, we conducted a study by analyzing
around 2.2M reviews from the top 539 apps of this Android market. We found that
0.5\% of these reviews are related to the security and privacy concerns of the
users. We further investigated these apps by performing dynamic analysis which
provided us valuable insights into their actual behaviors. Based on the
different perspectives, we categorized the apps and evaluated how the different
factors influence the users' perception of the apps. It was evident from the
results that the number of permissions that the apps request plays a dominant
role in this matter. We also found that sending out the location can affect the
users' thoughts about the app. The other factors do not directly affect the
privacy and security concerns for the users.
