Android OS

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The current version of Android is

Android 11

The two types of apps

Installed and pre-installed

Linux Kernel Level

Acts as an abstraction layer between the software/hardware present on the device and the drivers needed to facilitate this are present here Manages the core functionality of Android

Replaced Dalvik Virtual Machine

Android Runtime (ART)

Dalvik Virtual Machine

Android applications run Java programs _____________

Permission Model

Any Android Application must be granted permission to access sensitive functionality by the user The ability for users to pick and choose which permissions they wanted to accept or deny was first implemented in Android 6

Ahead-Of-Time (AOT)

Compiles entire application into native machine code upon their installation Automatically increase the install time for an application Eliminates Dalvik's JIT, thereby increases the efficiency Reduces power consumption

Application Sandbox

Each application runs as a unique user. In other words, a UID is assigned to each application and is run as a separate process. This concept ensures an application sandbox at the kernel level

Just-In-Time (JIT)

Frequently executed operations are identified and dynamically compiled to the native machine code

With Android 6, Google has mandated _________ for MOST DEVICES

Full disk encryption

Java APA Framework Layer

Handles basic phone functions

TEE

Is used to perform such operations and the software on the main processor delegates operations that require the use of secret data to the TEE processor

Application Signing

It is mandatory that all apps must be digitally signed

Libraries Layer

Responsible for providing support for the core features

Secure Kernel

Security features that are inherent to the Linux Kernel are automatically adopted by Android With each Android release, the kernel also changes

Hardware Abstraction Layer

This layer exposes the device hardware capabilities to high level Java framework Consists of library modules that implement interfaces for specific types of software

True or False; Android is open source

True

Android Keystore

Used to protect cryptographic keys from unauthorized access

System Apps Layer

User can interact directly with device


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