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The root of trust resides in the Pluton security subsystem. Each layer of the architecture assumes that the layer above it may be compromised. Within each layer, resource isolation and dynamic compartments provide added security. The Pluton security subsystem is the hardware-based in silicon secured root of trust for Azure Sphere. As part of the secured boot process, the Pluton subsystem boots various software components. It also provides runtime services, processes requests from other components of the device, and manages critical components for other parts of the device.

It enables hardware-based compartmentalization of processes by using trust zone functionality and is responsible for running the operating system, high-level applications, and services. Your high-level applications run in NW user mode. Such applications can map peripherals and communicate with high-level applications but cannot access the internet directly.

High-level applications can configure, use, and query the wireless communications subsystem, but they cannot program it directly. In addition to or instead of using Wi-Fi, Azure Sphere devices that are properly equipped can communicate on an Ethernet network. The firewalls impose compartmentalization, thus preventing a security threat that is localized in the high-level application core from affecting the real-time cores' access to their peripherals.

The high-level application platform runs the Azure Sphere OS along with a device-specific high-level application that can communicate both with the internet and with real-time capable applications that run on the real-time cores. The following figure shows the elements of this platform.

Microsoft provides and maintains all software other than your device-specific applications. All software that runs on the device, including the high-level application, is signed by the Microsoft certificate authority CA. Application updates are delivered through the trusted Microsoft pipeline, and the compatibility of each update with the Azure Sphere device hardware is verified before installation.

It consists of libraries and runtime services that run in NW user mode. This environment supports the high-level applications that you create. These restrictions ensure that the platform remains secured and that Microsoft can provide security and maintenance updates. In addition, the constrained libraries provide a long-term stable API surface so that system software can be updated to enhance security while retaining binary compatibility for applications.

OS services host the high-level application container and are responsible for communicating with the Azure Sphere Security Service.

They manage network authentication and the network firewall for all outbound traffic. The custom Linux-based kernel runs in supervisor mode, along with a boot loader. It provides a surface for preemptable execution of user-space processes in separate virtual address spaces. It is responsible for protecting security-sensitive hardware, such as memory, flash, and other shared MCU resources and for safely exposing limited access to these resources.

The Security Monitor brokers and gates access to the Pluton Security Subsystem and the hardware root of trust and acts as a watchdog for the NW environment. It starts the boot loader, exposes runtime services to NW, and manages hardware firewalls and other silicon components that are not accessible to NW. The Azure Sphere Security Service comprises three components: password-less authentication, update, and error reporting.

The authentication component provides remote attestation and password-less authentication. The remote attestation service connects via a challenge-response protocol that uses the measured boot feature on the Pluton subsystem. It verifies not merely that the device booted with the correct software, but with the correct version of that software. After attestation succeeds, the authentication service takes over.

The authentication service communicates over a secured TLS connection and issues a certificate that the device can present to a web service, such as Microsoft Azure or a company's private cloud.

The web service validates the certificate chain, thus verifying that the device is genuine, that its software is up to date, and that Microsoft is its source.

The device can then connect safely and securely with the online service. The update service distributes automatic updates for the Azure Sphere OS and for applications. The update service ensures continued operation and enables the remote servicing and update of application software. The error reporting service provides simple crash reporting for deployed software.

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