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Q: Fachverband Quantenoptik und Photonik
Q 39: Posters: Quantum Optics and Photonics III
Q 39.42: Poster
Mittwoch, 11. März 2020, 16:30–18:30, Empore Lichthof
Modification of a Continuous Variable Quantum Authentication Protocol with Physical Unclonable Keys — •Yannick Deller1, Georgios M. Nikolopoulos1,2, and Gernot Alber1 — 1TU Darmstadt, Darmstadt, Germany — 2Institute for Electronic Structure & Laser, FORTH, Heraklion, Greece
Entity authentication is an important cryptographic primitive with widespread applications. Entity authentication protocols (EAPs), which rely on physical unclonable keys (PUKs) and involve quantum challenges [1,2], promise a high level of security against classical and quantum adversaries. PUKs are disordered physical objects which are considered to be hard to clone or to simulate. Recently, Nikolopoulos and Diamanti proposed a quantum-optical continuous-variable EAP [2], where the PUK is materialised by a random multiple-scattering medium, while the challenges and the responses are coherent states of light. So far, the security of this protocol has been analysed in the framework of intercept-resend cheating strategies. We discuss the security of the protocol against an emulation attack, which relies on the use of linear quantum-optical chips. It is shown that the protocol of Ref. [2], in its simplest form, is not secure against such a type of attack. Moreover, we discuss possible straightforward modifications of the protocol, so that to prevent this attack, and analyse how the modifications impact the security of the protocol against intercept-resend cheating strategies.
[1] Goorden et al., Optica, Volume 1, 421 (2014)
[2] Nikolopoulos and Diamanti, Sci. Rep., Volume 7, 46047 (2017)