By Nikolay Elenkov
In Android safeguard Internals, most sensible Android defense professional Nikolay Elenkov takes us lower than the hood of the Android defense approach. Elenkov describes Android defense structure from the ground up, delving into the implementation of significant security-related elements and subsystems, like Binder IPC, permissions, cryptographic companies, and equipment administration.
How Android permissions are declared, used, and enforced
How Android manages software applications and employs code signing to make sure their authenticity
How Android implements the Java Cryptography structure (JCA) and Java safe Socket Extension (JSSE) frameworks
About Android's credential garage approach and APIs, which permit purposes shop cryptographic keys securely
About the net account administration framework and the way Google bills combine with Android
About the implementation of proven boot, disk encryption, lockscreen, and different gadget safety features
How Android's bootloader and restoration OS are used to accomplish complete procedure updates, and the way to acquire root access
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Extra info for Android Security Internals: An In-Depth Guide to Android's Security Architecture
Services can also define a remote interface using Android’s Security Model 11 AIDL and provide some functionality to other apps. However, unlike system services, which are part of the OS and are always running, application services are started and stopped on demand. Content providers Content providers provide an interface to app data, which is typically stored in a database or files. Content providers can be accessed via IPC and are mainly used to share an app’s data with other apps. Content providers offer fine-grained control over what parts of data are accessible, allowing an application to share only a subset of its data.
Finally, it returns the contents of the v0 register z. As you can see, Dalvik uses fewer instructions to achieve the same result. Generally speaking, register-based VMs use fewer instructions, but the resulting code is larger than the corresponding code in a stack-based VM. 3 In most production devices, system libraries and preinstalled applications do not contain device-independent DEX code directly. odex) file, which typically resides in the same directory as its parent JAR or APK file. A similar optimization process is performed for user-installed applications at install time.
System Services The layers introduced up until now make up the plumbing necessary to implement the core of Android— system services. 4) implement most of the fundamental Android features, including display and touch screen support, telephony, and network connectivity. Most system services are implemented in Java; some fundamental ones are written in native code. With a few exceptions, each system service defines a remote interface that can be called from other services and applications. Coupled with the service discovery, mediation, and IPC provided by Binder, system services effectively implement an object-oriented OS on top of Linux.
Android Security Internals: An In-Depth Guide to Android's Security Architecture by Nikolay Elenkov