Encrypted Configuration Storage
Store credentials and configuration with authenticated encryption, schema versioning and safe update semantics.
Arduino-compatible frameworks, ESP-IDF/FreeRTOS, PIC/AVR/STM32/RP-class systems; apply exact vendor documentation for the selected MCU.Architecture
Validated settings → versioned plaintext → AEAD encrypt with unique nonce → atomic record + tag.
Security and recovery risks
- Never reuse a nonce with the same key.nDo not log decrypted secrets.nFactory reset must define which identity/key material is preserved.
Implementation procedure
- Classify configuration fields.nKeep device key outside ordinary configuration storage.nUse authenticated encryption with unique nonces.nWrite new record, verify, then switch active pointer.nTest corruption, wrong key and schema migration.
Starter code / configuration
record = AEAD_Encrypt(key, unique_nonce, plaintext, associated_metadata);Verification evidence
| Test | Expected | Evidence |
|---|---|---|
| Nominal boot | Correct version and hardware revision reported | Captured boot log |
| Fault recovery | Defined safe state and reset reason | Fault-injection record |
| Power cycle | No corrupt configuration or unsafe output | Repeated-cycle log |
Required release artifacts
- Versioned firmware binary and SHA-256
- Source revision / build identifier
- Board and hardware-revision compatibility list
- Test report and known limitations
- Recovery image and factory-reset procedure
- Provisioning/calibration schema
- Release approval record
Local browser tools
Firmware production workbench
A/B update exercise
OTA and automatic rollback simulator
Advance one validated stage at a time. A failed boot test returns the device to the previous slot.
- Running confirmed firmware from Slot A.
Release gate
Production-readiness checklist
A downloadable release decision is generated only after every mandatory control is confirmed.