95 research outputs found
Continuous-variable quantum authentication of physical unclonable keys
We propose a scheme for authentication of physical keys that are materialized
by optical multiple-scattering media. The authentication relies on the optical
response of the key when probed by randomly selected coherent states of light,
and the use of standard wavefront-shaping techniques that direct the scattered
photons coherently to a specific target mode at the output. The quadratures of
the electromagnetic field of the scattered light at the target mode are
analysed using a homodyne detection scheme, and the acceptance or rejection of
the key is decided upon the outcomes of the measurements. The proposed scheme
can be implemented with current technology and offers collision resistance and
robustness against key cloning.Comment: 15 pages, 7 figure
Effects of Kerr nonlinearity in physical unclonable functions
We address the question of whether the presence of Kerr nonlinearity in
multiple-scattering optical media offers any advantage with respect to the
design of physical unclonable functions. Our results suggest that under certain
conditions, nonlinear physical unclonable functions can be more robust against
the potential cloning of the medium, relative to their linear counterparts that
have been exploited in the context of various cryptographic applications
Computational indistinguishability and boson sampling
We introduce a computational problem of distinguishing between the output of
an ideal coarse-grained boson sampler and the output of a true random number
generator, as a resource for cryptographic schemes, which are secure against
computationally unbounded adversaries. Moreover, we define a cryptographic
setting for the implementation of such schemes, including message encryption
and authentication, as well as entity authentication
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