  In this paper we experimentally evaluate a physical unclonable function based
on a polymer optical waveguide, as a time-invariant, replication-resilient,
source of entropy. The elevated physical unclonability of our implementation is
combined with spatial light modulation and post processing techniques, thus
allowing the deterministic generation of an exponentially large pool of
unpredictable responses. The quality of the generated numbers is validated
through NIST/DIEHARD(ER) suites, whereas the overall security of the scheme is
benchmarked assuming attackers with elevated privileges in terms of system
access. Finally, based on the demonstrated key features, we present and analyze
a mutual authentication implementation scenario which is fully compatible with
state-of-the-art commercial Internet-Of-Things architectures
