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Laser Damage Helps the Eavesdropper in Quantum Cryptography
KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
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2014 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 112, no 7, p. 070503-Article in journal (Refereed) Published
Abstract [en]

We propose a class of attacks on quantum key distribution (QKD) systems where an eavesdropper actively engineers new loopholes by using damaging laser illumination to permanently change properties of system components. This can turn a perfect QKD system into a completely insecure system. A proof-of-principle experiment performed on an avalanche photodiode-based detector shows that laser damage can be used to create loopholes. After similar to 1 W illumination, the detectors' dark count rate reduces 2-5 times, permanently improving single-photon counting performance. After similar to 1.5 W, the detectors switch permanently into the linear photodetection mode and become completely insecure for QKD applications.

Place, publisher, year, edition, pages
2014. Vol. 112, no 7, p. 070503-
Keywords [en]
Tailored Bright Illumination, Key Distribution, Avalanche Photodiodes, Security, Mechanisms, Photons, Devices, Attack
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Identifiers
URN: urn:nbn:se:kth:diva-143435DOI: 10.1103/PhysRevLett.112.070503ISI: 000331952500001Scopus ID: 2-s2.0-84894494194OAI: oai:DiVA.org:kth-143435DiVA, id: diva2:706957
Note

QC 20140324

Available from: 2014-03-24 Created: 2014-03-21 Last updated: 2017-12-05Bibliographically approved

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