How is the security of standard Intents implemented in Android applications?

The security of standard Intents in Android is ensured by several mechanisms:

1. Explicit Intents — when you explicitly specify the component (Activity, Service, or BroadcastReceiver class) that should handle the Intent. This prevents other applications from intercepting the Intent.

2. Permission checks — components may require certain permissions to be launched, which restricts access.

3. Use of security flags — for example, FLAG_GRANT_READ_URI_PERMISSION for temporarily granting access to a URI.

4. Validation of Intent data — always validate incoming data to prevent injections or unwanted actions.

5. Protection against implicit Intents — if an Intent is implicit, the system searches for suitable components, which can be risky. Therefore, it is recommended to use explicit Intents for internal calls.

Example of an explicit Intent:

val intent = Intent(this, TargetActivity::class.java)
startActivity(intent)

Thus, security is achieved through proper use of explicit Intents, permission control, and data validation.