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dc.contributor.authorThornton, Matthew
dc.contributor.authorScott, Hamish
dc.contributor.authorCroal, Callum
dc.contributor.authorKorolkova, Natalia
dc.identifier.citationThornton , M , Scott , H , Croal , C & Korolkova , N 2019 , ' Continuous-variable quantum digital signatures over insecure channels ' , Physical Review. A, Atomic, molecular, and optical physics , vol. 99 , no. 3 , 032341 .
dc.identifier.otherPURE: 259546601
dc.identifier.otherPURE UUID: 468ba955-b784-4e67-b110-fd6ca708eb97
dc.identifier.otherScopus: 85064049094
dc.identifier.otherORCID: /0000-0003-3599-612X/work/59464952
dc.identifier.otherORCID: /0000-0003-4830-9667/work/59465049
dc.identifier.otherWOS: 000462868800008
dc.descriptionFunding: The authors gratefully acknowledge the support from the Scottish Universities Physics Alliance (SUPA) and the Engineering and Physical Sciences Research Council (EPSRC).en
dc.description.abstractDigital signatures ensure the integrity of a classical message and the authenticity of its sender. Despite their far-reaching use in modern communication, currently used signature schemes rely on computational assumptions and will be rendered insecure by a quantum computer. We present a quantum digital signatures (QDS) scheme whose security is instead based on the impossibility of perfectly and deterministically distinguishing between quantum states. Our continuous-variable (CV) scheme relies on phase measurement of a distributed alphabet of coherent states and allows for secure message authentication against a quantum adversary performing collective beamsplitter and entangling-cloner attacks. Crucially, in the CV setting we allow for an eavesdropper on the quantum channels and yet retain shorter signature lengths than previous protocols with no eavesdropper. This opens up the possibility to implement CV QDS alongside existing CV quantum key distribution platforms with minimal modification.
dc.relation.ispartofPhysical Review. A, Atomic, molecular, and optical physicsen
dc.rights© 2019, American Physical Society. This work has been made available online in accordance with the publisher's policies. This is the final published version of the work, which was originally published at
dc.subjectQA75 Electronic computers. Computer scienceen
dc.subjectQC Physicsen
dc.titleContinuous-variable quantum digital signatures over insecure channelsen
dc.typeJournal articleen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews.School of Physics and Astronomyen
dc.description.statusPeer revieweden

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