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Along with the exponential growth on markets of mobile Applications (apps), comes the serious public concern about the security and privacy issues. Therefore automatic app risk assessment becomes increasingly important to support users with useful evidences for their decisions. User comment provides a unique perspective from actual user experience, and should be considered valuable information source for risk assessment for mobile apps. In this paper, we provide a novel perspective to view the risk assessment of an app from its user comments as a crowdsourcing problem and adopt ranking model as the evaluation method. We develop a co-training scheme to amalgamate feature learning and learning to rank models. Experiments conducted on two different real-world datasets show substantial performance improvements (i.e., 6%–7%) over the state-ofthe-art methods.

Mobile App Security Risk Assessment: A Crowdsourcing Ranking Approach from User Comments