Secure Boot From Ground Up™

Build a production-minded Secure Boot chain on STM32, including signing workflows, flash layout, policy enforcement.

What you’ll learn
✓ Design and implement secure boot architecture for constrained microcontrollers
✓ Run real signing workflows and implement reusable host-side scripts and tooling
✓ Define flash layouts for verified firmware slots and multi-slot systems
✓ Package firmware images with headers, hashes, and signatures
✓ Implement on-device verification for authenticity and integrity before execution
✓ Build policy enforcement: slot rules, version rules, anti-rollback, trial boot and confirm

Requirements
● NUCLEO-F411

Description
Secure boot exists to answer one question: should this firmware be allowed to run?

If the answer is no, the device must follow a defined fail-safe path, not guess. It must refuse execution, enter a safe state, and recover deterministically. That is what senior embedded engineers are expected to design, and it is exactly what you will build in this course.

This is not a “verify a signature” demo and it is not a black-box library tour. You will implement a complete, production-minded secure boot workflow on real STM32 hardware in bare-metal code. You will work through a deliberate sequence of engineering milestones that progressively turn a bare-metal MCU into a system that can make trust decisions, enforce policy, and recover safely when anything goes wrong.

What you build

By the end, you will have a portfolio-grade secure boot system that

• Boots only authorized, signed firmware

• Rejects tampered, corrupted, or unexpected images before execution

• Enforces a policy-aware flash layout with verified slots

• Implements rollback control and trial boot plus confirm behavior

• Executes deterministic recovery when no valid image is available

• Produces release-ready engineering artifacts you can reuse in real product

How the course is structured

You start with the foundations: authenticity, integrity, trust boundaries, root of trust, chain of trust, policy decisions, and failure behavior. Then you implement the full system through a carefully designed project ladder, where each step becomes a concrete engineering capability.

Project milestones

Flash protection and immutability
You learn how real devices prevent boot code tampering. You implement and test flash write protection using option bytes, and you see the practical implications for debugging and recovery.

Integrity with firmware hashing
You implement SHA-256 integrity checks and learn the rules that make or break real systems: what bytes are covered, padding, placement, and how corruption and partial writes surface in real life.

Authenticity with digital signatures
You add ECDSA P-256 signature verification on-device. You embed a public-key trust anchor in firmware and build the full verification flow: hash plus signature equals authenticity.

Bootloader to application execution mechanics
You implement correct bootloader-to-app handoff: MSP setup, VTOR relocation, reset handler dispatch, and the details that prevent a dangerous class of failures like “verify one image, execute another.”

Secure boot, single-slot
You merge integrity and authenticity into the bootloader and enforce verify-then-jump. You add a fixed app header with policy-relevant metadata so the system can make disciplined boot decisions.

Capstone, SBSFU-style system
You implement a complete multi-slot secure boot system on STM32 with Slot A, Slot B, staging, flash-backed boot flags with integrity checks, rollback rules, and deterministic recovery paths.

What makes this course different

Most embedded engineers encounter secure boot as a vendor provided framework. The host tooling packages images, the libraries verify them, and the system works, but the underlying mechanics stay opaque. That is a problem when you need to design, debug, port, audit, or explain secure boot under real constraints.

This course is different because you build the complete secure boot system end to end

• The host side pipeline that packages images with headers, hashes, signatures, and policy relevant metadata

• The on device verifier that parses, hashes, verifies, enforces policy, and decides whether execution is allowed

• The system behavior that matters in production: multi-slot layout, rollback control, trial boot and confirm, and deterministic recovery when anything fails

You do not just learn secure boot. You own it.

What you will be able to do after this course

• Design secure boot architecture for constrained microcontrollers

• Define flash layouts for verified firmware slots and multi-slot systems

• Package images with headers, hashes, and signatures

• Implement on-device verification for authenticity and integrity before execution

• Build policy enforcement: slot rules, version rules, anti-rollback, trial boot and confirm

• Implement deterministic recovery strategies, not undefined behavior

• Run real signing workflows and use reusable host-side scripts and tooling

Who this is for

This course is built for developers who want senior-level capability, not surface familiarity

• Embedded firmware engineers who want to design secure boot from scratch

• IoT and device engineers preparing for security-focused roles

• Engineers who can write drivers but want system-level boot and update discipline

• Anyone who wants a portfolio project that demonstrates real security engineering maturity

If you want a secure boot system you can ship with confidence, explain clearly, and defend under scrutiny, this is the foundation.

Enroll now and build a secure boot chain that decides what can run, when it can run, and how the device behaves when anything goes wrong.

Who this course is for
■ Embedded firmware engineers who want to design secure boot from scratch
■ IoT and device engineers preparing for security-focused roles
■ Engineers who can write drivers but want system-level boot and update discipline
■ Anyone who wants a portfolio project that demonstrates real security engineering maturity

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