The functionality you can expect to get from the application covers the following: open and view PDF files, create new PDF files, edit PDF files. Muders, L.Master PDF Editor is all about helping you work with PDF files. TaintDroid: An Information Flow Tracking System for Real-Time Privacy Monitoring on Smartphones. PPTP vs L2TP vs OpenVPN vs SSTP vs IKEv2. Is this App Safe?: A Large Scale Study on Application Permissions and Risk Signals. Information Leakage Through Mobile Analytics Services. Remote Peering: More Peering Without Internet Flattening. Behavioral Detection of Malware on Mobile Handsets. An Android Application Sandbox System for Suspicious Software Detection. PScout: Analyzing the Android Permission Specification. Drebin: Effective and Explainable Detection of Android Malware in Your Pocket. F-Secure Freedome Anti-Tracking Feature Explained.Of particular concern are instances of apps that inject JavaScript programs for tracking, advertising, and for redirecting e-commerce traffic to external partners. We also report on a number of apps actively performing TLS interception. Our experiments reveal several instances of VPN apps that expose users to serious privacy and security vulnerabilities, such as use of insecure VPN tunneling protocols, as well as IPv6 and DNS traffic leakage. Our analysis includes investigation of possible malware presence, third-party library embedding, and traffic manipulation, as well as gauging user perception of the security and privacy of such apps. We perform a number of passive and active measurements designed to investigate a wide range of security and privacy features and to study the behavior of each VPN-based app. In this paper we provide a first comprehensive analysis of 283 Android apps that use the Android VPN permission, which we extracted from a corpus of more than 1.4 million apps on the Google Play store. In practice, however, users have little if any guarantees about the corresponding security and privacy settings, and perhaps no practical knowledge about the entities accessing their mobile traffic. Millions of users worldwide resort to mobile VPN clients to either circumvent censorship or to access geo-blocked content, and more generally for privacy and security purposes.
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