Your 4-Digit PIN Is Fine: Device-Bound Keys on ESP32-S3
Why PBKDF2 iterations can't protect a 4-digit PIN on a microcontroller, and how an eFuse-HMAC device secret plus HKDF stops offline brute force.
#key derivation
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Why PBKDF2 iterations can't protect a 4-digit PIN on a microcontroller, and how an eFuse-HMAC device secret plus HKDF stops offline brute force.