A Novel PUF Key Generation Method via Variable-Length Subkeys: An Application with Inertial MEMS Sensors

In this work, a novel PUF key generation algorithm is introduced that leverages the inherent variability in sensor properties to produce highly entropic keys for security applications. The approach uses variable-length subkeys, which are encoded into a fixed-length final key. The encoding is specifically designed to preserve the subkey length information during key generation. Real-world measurements from high-fidelity inertial MEMS sensors (gyroscopes and accelerometers) were used to verify the proposed technology. Our experimental evaluation demonstrates strong uniqueness and reliability with stable performance under controlled conditions.