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IoT Security: From Secure Boot to OTA Updates

Implementing End-to-End Security for Connected Devices

Technical summary
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Executive summary

IoT device security requires a defense-in-depth approach spanning hardware, firmware, and cloud connectivity. This guide covers the complete security lifecycle from hardware root of trust implementation to secure over-the-air update mechanisms, with practical implementation guidance for embedded systems.

Key findings

  • A hardware root of trust anchors secure boot so only signed firmware runs
  • Signed, versioned OTA with anti-rollback closes the most common persistence path
  • TLS 1.3 with mutual authentication protects device–cloud links
  • EU RED Delegated Regulation 2022/30 (EN 18031-1/-2/-3) applies to internet-connected radio products since 1 August 2025; the Cyber Resilience Act’s reporting duties apply from 11 September 2026
  • Continuous vulnerability monitoring against an SBOM is now a regulatory expectation (EU CRA)

What the paper covers

  1. 01IoT Security Threat Landscape
  2. 02Hardware Security Foundations
  3. 03Secure Boot Implementation
  4. 04Cryptographic Best Practices
  5. 05Secure Communication Protocols
  6. 06OTA Update Security
  7. 07Vulnerability Management
“Security has to be designed in from the first schematic: a hardware root of trust, signed and versioned firmware updates, and an SBOM kept current for the whole support period.”
Rapid Circuitry engineering team, Embedded security

Related topics

  • IoT security
  • secure boot
  • OTA updates
  • hardware security
  • encryption
  • authentication