Summary

Android is a modern operating system where security is built in the platform. As we learned in this chapter, the Linux kernel, with its process isolation, provides the basis of Android's security model. Each application, along with its application data, is isolated from other processes. At the application level, components talk to each other using Intents and need to have appropriate privileges to call other components. These permissions are enforced in the Linux kernel that has stood the test of time as a secure multiuser operating system. Developers have a comprehensive set of crypto APIs that secure user data.

With this basic knowledge of the Android platform, let's march to the next chapter and understand application components and inter-component communication from a security standpoint. Good luck!