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Optical physical unclonable keys are currently considered to be ratherpromising candidates for the development of entity authentication protocols,which offer security against both classical and quantum adversaries. In thiswork we investigate the robustness of a continuous-variable protocol, whichrelies on the scattering of coherent states of light from the key, againstthree different types of intercept-resend emulation attacks. The performance ofthe protocol is analysed for a broad range of physical parameters, and ourresults are compared to existing security bounds.

Intercept-Resend Emulation Attacks Against a Continuous-Variable Quantum Authentication Protocol with Physical Unclonable Keys