International Association for Cryptologic Research
The concept of quantum-secure readout of Physical Unclonable Functions (PUFs) has recently been realized experimentally in an optical PUF system. The authors analyze the security of this system under the strongest type of classical attack: the challenge estimation attack. The adversary performs a measurement on the challenge quantum state in order to learn as much about it as they can. Using this knowledge the user then tries to reconstruct the challenge and to emulate the PUF. They consider quadrature measurements, which are the most informative practical measurements known to them.