When i install apps ,that i take from my friends , it seems quite fishy , so how to check that the apps are trusted or not.
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See also: What is master key vulnerability in android? – Izzy♦ Jun 5 '14 at 11:14
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You can check whether your device is affected using e.g. Bluebox Security Scanner.
To close the vulnerability, your device needs root access. If that pre-condition is given, there are different fixes available, e.g.
- Master Key dual fix (a module for the xposed-framework)
- Master-Key Security Patch (again a module for Xposed)
- ReKey (a stand-alone app)
