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Arduino & IoT Academy · Lesson

Keep Secrets Out of Code

Store credentials safely, not in plain text.

What Counts as a Secret

WiFi passwords, API tokens, and private keys are all secrets. Anything that grants access must never sit in plain sight inside your sketch. 🔑

The Danger of Plaintext Keys

Flash memory can be read back over the wire. A plaintext key in your code is one chip dump away from being copied by anyone.

String apiKey = "AKIA12345SECRET"; // visible to anyone who reads the flash

All lessons in this course

  1. Common IoT Attack Surfaces
  2. Keep Secrets Out of Code
  3. Encrypt with TLS & Verify Certs
  4. Sign & Lock Down Firmware
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