True." First, I would like to give credit to my colleagues Uli's tenkai Karen Gong Jun advisor card Gunter. As you may know, Android relies on a permission model to regulate application access to system resources. Before version six, this was known as the install time permission model. In this model, the user would go to the official Android application store, select an application to install, and then have to accept all permissions required by the application as a precondition for installation on their phone. Now, in Android, these permissions are categorized based on their protection level into four different classes. All of these permissions are granted during installation. Normal permissions are automatically granted by the system, as they predict non-sensitive resources on the device. Signature permissions can only be granted to applications that are signed with the same developer key as the application that defined the permission. Dangerous permissions can only be granted by the user. And signature system permissions are granted to system services and system applications. For the rest of this presentation, we will focus on the latter kind, which does not affect third-party applications. Our discussion will specifically consider third-party applications. In version 6, Android finally switched to the runtime permission model. This change was highly anticipated and advocated for by the community for a long time. With this change, dangerous permissions are now requested from the user when the application wants to utilize them, providing users with context to make informed decisions. Additionally, Android organizes permissions into permission groups to reduce user burden. For example, a group may consist of multiple dangerous permissions, and if the user grants one dangerous permission to an app, the system will automatically grant the remaining dangerous permissions to the app. Apart from system-defined permissions, Android also allows third-party developers to declare their own...
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