Firmware Articles
ESP32 Secure Boot and Flash Encryption: A Practical Setup Guide
In the first post we made the case for the two locks (secure boot for integrity, flash encryption for confidentiality) and introduced the one idea that governs everything else: these protections only move forward. You can turn them on, but never turn them off. Now let’s actually turn them on. We’ll use the ESP32 (specifically […]
Your ESP32 Product Ships With the Doors Unlocked: Secure Boot and Flash Encryption Explained
Take a fresh microcontroller out of the box, flash your firmware, and it just runs. Flash a completely different firmware and it runs that one just as happily; it has no particular loyalty to the code you consider yours. Connect an inexpensive adapter and read the flash back, and the bytes come off unencrypted. The […]