2015/02/04 by Elizabeth Newton, Matthew Everitt, Matthew C. J. Everitt +6
Computer Science · Physics and Astronomy · #Chaos-based Image/Signal Encryption #Cryptographic Implementations and Security #FOS: Physical sciences #Quantum Physics (quant-ph) #Quantum-Dot Cellular Automata #quant-ph
paper · pdf · doi:10.48550/arxiv.1502.01169
openalex publication_date 2015/02/04 · arxiv created 2015/06/18 · arxiv updated 2015/06/19 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
Experimental Quantum Key Distribution (QKD) protocols have to consist of not only the unconditionally secure quantum transmission, but also a subsequent classical exchange that enables key reconciliation and error correction. There is a large body of work examining quantum attacks on the quantum channel, but here we begin to examine classical attacks to both the classical communication and the exchange as a whole. Linking together separate secure protocols can unexpectedly leak information to an eavesdropper, even if the components are unconditionally secure in isolation. Here we focus specifically on the join between quantum and classical protocols, finding that in just this crossing of the quantum-classical boundary, some security is always and unintuitively lost. This occurs with no communication between the separate parties. While this particular example applies to only Continuous Variable Quantum Key Distribution (CVQKD), it highlights the need to re-examine the way all individual protocols are actually used.