I recently started looking at Android apps that listen on network ports. Searching for port 30102 led me to this recent paper: Understanding Open Ports in Android Applications: Discovery, Diagnosis, and Security Assessment https://daoyuan14.github.io/papers/NDSS19_OpenPort.pdf …
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android.permission.INTERNET is needed to listen on a network port. This is a "normal" Android permission, which means that the user isn't asked for it and the user cannot deny it. Of the apps on your Android phone, do you know which are listening, waiting for anybody to connect?
12:15 PM - 11 Mar 2019
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