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Mastering Mobile Forensics
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Understanding every smartphone's OS security model is a big deal in the forensic context. All vendors and smartphones manufacturers care about securing their user's data, and in most cases, the security model implemented can cause a real headache to every forensic examiner, and Android is no exception. Android, as you know, is an open source OS built on the Linux kernel and provides an environment offering the ability to run multiple applications simultaneously. Each application is digitally signed and isolated in its very own sandbox; each application sandbox defines the application's privileges. Above the kernel, all activities have constrained access to the system.
Android OS implements many security components and has many considerations for its various layers; the following diagram summarizes the Android security architecture on ARM with TrustZone support:

Most recent Android devices provide a secondary environment/OS: the Secure OS is dedicated...
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