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Showing embedded developers the way to secure products, step by step
You Should Know:
1. Secure Key Storage
- Use Hardware Security Modules (HSMs) or Trusted Platform Modules (TPMs) for key storage.
- Linux Command: Generate and store keys using
openssl:openssl genpkey -algorithm RSA -out private_key.pem -aes256
- STM32: Utilize STM32’s OTP (One-Time Programmable) memory or Flash with write protection.
2. Entropy Pool Issues
- Check available entropy on Linux:
cat /proc/sys/kernel/random/entropy_avail
- Improve entropy with
haveged:sudo apt install haveged sudo systemctl enable --now haveged
3. AES Implementation Validation
- Verify AES encryption/decryption using
openssl:openssl enc -aes-256-cbc -in plaintext.txt -out encrypted.bin -k "YourPassword" openssl enc -d -aes-256-cbc -in encrypted.bin -out decrypted.txt -k "YourPassword"
- For STM32, use STM32 Cryptographic Library (STM32-CRYP-LIB).
4. Bootloader Security
- Sign firmware updates:
openssl dgst -sha256 -sign private_key.pem -out firmware.bin.sig firmware.bin
- Validate on device using public key.
5. TRNG (True Random Number Generator)
- Test randomness with
rng-tools:sudo apt install rng-tools rngtest -c 1000 /dev/hwrng
What Undercode Say:
Embedded security demands actionable steps, not theoretical fluff. Focus on:
– Key management (HSM/TPM).
– Entropy hardening (haveged, rng-tools).
– Validated crypto (OpenSSL, STM32-CRYP-LIB).
– Secure bootloaders (signed updates).
Expected Output:
A secure, auditable embedded system with:
- Protected keys.
- Reliable entropy.
- Verified AES.
- Tamper-proof bootloaders.
Relevant URLs:
References:
Reported By: Mrybczynska Id – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
