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Temporal wavefront shaping for security applications

Matthias C. Velsink, Lars van der Hoeven, Pepijn W. H. Pinkse

Published Oct 8, 2019• 0 citations
OpenAlex

Abstract

Recently, we applied wavefront shaping techniques to implement quantum-secure readout of a physical unclonable key for authentication [1]. Unfortunately, spatial wavefront shaping is unsuitable for long distance use. We therefore propose to use wavefront shaping in the time domain. We show temporal focusing of a pulse through a complex medium. Furthermore, we investigate a secure communication method based on physical unclonable functions in the time domain. We will report on the progress. [1] S.A. Goorden et al., Quantum-secure authentication of a physical unclonable key, Optica 1 , 421-424 (2014)

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Recently, we applied wavefront shaping techniques to implement quantum-secure readout of a physical unclonable key for authentication [1]. Unfortunately, spatial wavefront shaping is unsuitable for long distance use. We therefore propose to use wavefront shaping in the time domain. We show temporal focusing of a pulse through a complex medium. Furthermore, we investigate a secure communication method based on physical unclonable functions in the time domain. We will report on the progress. [1] S.A. Goorden et al., Quantum-secure authentication of a physical unclonable key, Optica 1 , 421-424 (2014)
Recently, we applied wavefront shaping techniques to implement quantum-secure readout of a physical unclonable key for authentication [1]. Unfortunately, spatial wavefront shaping is unsuitable for long-distance use. We therefore propose to use wavefront shaping in the time domain using a single spatial mode. We show spatiotemporal control of a pulse through a complex medium. Furthermore, we investigate a secure communication method based on physical unclonable functions in the time domain. We will report on the progress.
We introduce time-domain physical unclonable functions (tPUFs) using photonic ring resonator networks, fabricated on a silicon nitride platform. These tPUFs demonstrate complex spectro-temporal behavior, enabling their use in secure, remote authentication schemes. Physical unclonable functions (PUFs) offer an alternative to conventional hash functions by leveraging the intrinsic randomness of physical structures [1], [2]. Optical PUFs have historically been realized using strongly scattering media [3], [4]. We introduce time-domain PUFs (tPUFs) that employ temporal scrambling, allowing for read-out over a single spatial mode. This allows integration into existing infrastructure, such as telecom fibers and satellite links.
Secure communication is of crucial importance for many applications. Currently communication security is based on encryption protocols which are computationally hard to crack by classical computers. However, it is generally believed that quantum computers will be able to decipher these encryption methods. Quantum communication has to potential to solve this threat, but it is vulnerable to man-in-the-middle attacks. Recently, Goorden et al. proposed a scheme which uses a multiple-scattering key as an authentication device, which solves the man-in-the-middle threat.[1] As a next step towards secure quantum communication we propose a Shih-Alley type of entanglement generation in such a scattering key.[2] This would enable us to develop a one-sided device-independent communication protocol. We report on the latest developments in this experiment. [1] S.A. Goorden et al., Optica 1, 421-424 (2014) [2] Y.H. Shih et al., Phys. Rev. Lett. 61, 2921 (1988)