In Android development, caller identity authentication is like a cat-and-mouse game between developers and "black hats." Developers play the role of the "cat," trying every means to protect the "cheese," while "hackers" are the "mice," constantly searching for vulnerabilities to breach defenses.

A slight oversight can allow the "mice" to slip in silently, steal data, escalate privileges, or even crash the system. This article will explore strategies in this cat-and-mouse game—how to perform reasonable and correct identity authentication. We will start with some real-world cases to help everyone recognize and understand some misconceptions about identity calls, reducing the security risks associated with improper operations and leaving the "mice" with nowhere to hide.

2. Common Hazards: Crises Behind the Defense Line

3. The "Illusion" of Activity Identity Authentication
3.1 Accurate Targeting: Using Reflection on mReferrer to Obtain Caller Package Name
3.2 Accurate Targeting: Using Reflection on getLaunchedFromPackage to Obtain Caller Package Name

4. The "Blind Spot" of Broadcast Identity Authentication

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