Security Updates

Community

beriberikix

security-updates

Secure boot and firmware update workflows for Zephyr RTOS. Covers MCUboot integration, production image signing, DFU protocols (MCUmgr), fail-safe rollback mechanisms, and mbedTLS crypto basics. Trigger when implementing over-the-air (OTA) updates, securing the boot process, or managing cryptographic keys.

Overview

Publisher	beriberikix
Repository	`zephyr-agent-skills`
Skill name	`security-updates`
Stars	73
Forks	19
Bundled files	8
License	Apache-2.0
Links	Skill source Repository

Markdown instructions
A SKILL.md file the model loads on demand, so it only costs tokens when a request actually matches.
Works with any LLM
AI skills are plain Markdown, not provider-specific code, so this works with GPT, Claude, Gemini, Grok, or a local model.
8 bundled files
Scripts, templates, and references the model can read while it works. Files are read-only and never executed.
Open source
Published by beriberikix on GitHub. Read the source before you install it.

Installation

Install the Security Updates AI skill in TypingMind to use it with any LLM, or drop it into another agent that reads SKILL.md.

Install in TypingMind

TypingMind installs a skill straight from its GitHub folder — it reads SKILL.md, bundles the resource files, and stores the result locally.

Open the app and go to Plugins → Skills.
Choose "Install from GitHub".
Paste the skill folder URL below and confirm.
https://github.com/beriberikix/zephyr-agent-skills/tree/main/skills/security-updates
Enable the skill in any chat where you want it available.

Plugins → Skills → Add skill → From GitHub URL, then paste the folder URL and press Continue.

Install in another agent

Any agent that reads the Agent Skills format can use this skill — copy the folder into that agent's skills directory.

Claude Code — .claude/skills

git clone --depth 1 https://github.com/beriberikix/zephyr-agent-skills.git /tmp/zephyr-agent-skills
mkdir -p .claude/skills
cp -r /tmp/zephyr-agent-skills/skills/security-updates .claude/skills/security-updates

Restart Claude Code after copying so it picks up the new skill.

Use it in TypingMind

Enable Security Updates in any TypingMind chat and the model takes it from there. Its name and description sit in the system prompt, and the moment a request matches, the model loads the full instructions itself — you never invoke it by hand, and it costs no tokens until it is actually used.

The model loads Security Updates on its own as soon as a request matches it.

Works with any AI model

AI skills are plain Markdown instructions rather than provider-specific code, so Security Updates is not tied to the model it was written for. Install it once in TypingMind and use it with GPT-5, Claude, Gemini, Grok, DeepSeek, Mistral, Llama, or a local model you run yourself — all on your own API keys.

Loaded only when it is needed
The system prompt carries just the name and description. The instructions are fetched on the first matching request, so an idle skill costs nothing.
Switch models mid-chat
Because the skill is instructions rather than code, changing model does not break it — the next model reads the same SKILL.md.

Skill instructions

This is the SKILL.md content the model loads. Read it before installing — a skill is instructions your model will follow.

Zephyr Security & Updates

Build production-ready, secure embedded systems using Zephyr's modular security stack and MCUboot bootloader.

Core Workflows

1. MCUboot Integration

Set up the secure bootloader and define fail-safe flash partitions.

Reference: mcuboot_integration.md
Key Tools: CONFIG_BOOTLOADER_MCUBOOT, fixed-partitions, Devicetree.

2. Image Signing

Ensure firmware integrity with production-grade digital signatures.

Reference: image_signing.md
Key Tools: imgtool.py, ECDSA-P256, RSA.

3. DFU Protocols

Transport updates securely using MCUmgr or cloud-based OTA.

Reference: dfu_protocols.md
Key Tools: mcumgr, Golioth OTA, SMP transport.

4. Rollback Protection

Implement atomic swaps and image confirmation to prevent bricking devices.

Reference: rollback_protection.md
Key Tools: boot_write_img_confirmed(), mcumgr image test.

5. Crypto Basics

Implement secure storage and cryptographic operations using mbedTLS.

Reference: crypto_basics.md
Key Tools: CONFIG_MBEDTLS, TF-M, secure storage.

Quick Start (Kconfig for Secure Boot)

kconfig
# Enable MCUboot support in application
CONFIG_BOOTLOADER_MCUBOOT=y

bash
# Build with MCUboot using Sysbuild
west build -b nucleo_f401re --sysbuild samples/basic/blinky

Professional Patterns (Security-First)

Production Keys: Never use default MCUboot keys. Provision unique keys during manufacturing.
Heartbeat Confirmation: Only confirm a new image after the application has successfully connected to its cloud backend.
Version Integrity: Enable version monotonicity to prevent accidental or malicious firmware downgrades.

Automation Tools

mcuboot_version_guard.py: Enforce monotonic semantic version progression in update pipelines.

Examples & Templates

mcuboot_prj_fragment.conf: Starter secure-boot + image-management config fragment.

Validation Checklist

Signed image verifies at boot and unsigned/tampered image is rejected.
DFU flow completes end-to-end and boots into the new slot.
Rollback behavior triggers correctly when image confirmation is withheld.
Key handling and version policy prevent downgrade and test-key usage in production configs.

Resources

References:
- mcuboot_integration.md: Partition layouts and setup.
- image_signing.md: Key management and imgtool usage.
- dfu_protocols.md: MCUmgr commands and cloud OTA.
- rollback_protection.md: Swap mechanisms and confirmation code.
- crypto_basics.md: mbedTLS and secure storage.
Scripts:
- mcuboot_version_guard.py: Version monotonicity checker for release gates.
Assets:
- mcuboot_prj_fragment.conf: Secure-update config baseline.

Bundled files

The model reads these on demand while the skill is loaded. They are exposed as readable files and are never executed.

Frequently asked questions

What does the Security Updates AI skill do?

Why use Security Updates on TypingMind?

Because you install it once and use it with any model. Security Updates is plain Markdown rather than provider-specific code, so the same skill runs on GPT-5, Claude, Gemini, Grok, or a local model — and you can switch model mid-chat without it breaking. TypingMind runs on your own API keys, so you pay providers directly instead of a per-seat subscription, and your skills and chats stay in your own storage.

How do I install Security Updates in TypingMind?

Open Plugins → Skills → Install from GitHub in TypingMind and paste https://github.com/beriberikix/zephyr-agent-skills/tree/main/skills/security-updates. TypingMind reads its SKILL.md and bundles its files and installs it as a skill you can enable per chat.

Which AI models can use Security Updates?

Any model you connect in TypingMind. AI skills are plain Markdown instructions rather than provider-specific code, so GPT, Claude, Gemini, Grok, and local models can all load this skill when a request matches it.

How many AI models can I use with Security Updates?

As many as you like. As long as a model supports skills, you can use Security Updates with it — GPT, Claude, Gemini, Grok, DeepSeek, Mistral, Llama and more — all on TypingMind with your own API keys.

Is the Security Updates AI skill free?

Yes. It is published on GitHub by beriberikix under the Apache-2.0 license. You only pay your own AI provider for the tokens you use.

What are AI skills?

An AI skill is a reusable instruction bundle that teaches an AI model how to do one specific task. It follows the open Agent Skills format: a SKILL.md file with a name and description, plus any scripts, templates or reference files the model may need. The model reads the instructions only when your request matches the skill, so an installed skill costs nothing until it is used.

How are AI skills different from plugins or MCP servers?

A plugin or MCP server gives a model new tools to call — code that runs somewhere and returns a result. An AI skill gives the model knowledge and process instead: how to approach a task, which steps to follow, what good output looks like. Skills are plain Markdown, so they need no server, no API key and no runtime, and they work with any model.

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Overview

Installation

Install in TypingMind

Install in another agent

Use it in TypingMind

Works with any AI model

Skill instructions

Zephyr Security & Updates

Core Workflows

1. MCUboot Integration

2. Image Signing

3. DFU Protocols

4. Rollback Protection

5. Crypto Basics

Quick Start (Kconfig for Secure Boot)

Professional Patterns (Security-First)

Automation Tools

Examples & Templates

Validation Checklist

Resources

Bundled files

Frequently asked questions

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