2026-07-24T10:14:52Z https://drops.dagstuhl.de/oai

oai:drops-oai.dagstuhl.de:12063 2024-03-06T10:49:11Z ddc:004 open_access

Uncloneable Quantum Encryption via Oracles Broadbent, Anne Lord, Sébastien Quantum Cryptography Symmetric Key Monogamy-of-Entanglement Quantum information is well known to achieve cryptographic feats that are unattainable using classical information alone. Here, we add to this repertoire by introducing a new cryptographic functionality called uncloneable encryption. This functionality allows the encryption of a classical message such that two collaborating but isolated adversaries are prevented from simultaneously recovering the message, even when the encryption key is revealed. Clearly, such functionality is unattainable using classical information alone. We formally define uncloneable encryption, and show how to achieve it using Wiesner’s conjugate coding, combined with a quantum-secure pseudorandom function (qPRF). Modelling the qPRF as an oracle, we show security by adapting techniques from the quantum one-way-to-hiding lemma, as well as using bounds from quantum monogamy-of-entanglement games. Schloss Dagstuhl – Leibniz-Zentrum für Informatik Anne Broadbent and Sébastien Lord 2020 Is Part Of LIPIcs, Volume 158, 15th Conference on the Theory of Quantum Computation, Communication and Cryptography (TQC 2020) InProceedings Text doc-type:ResearchArticle publishedVersion application/pdf doi:10.4230/LIPIcs.TQC.2020.4 urn:nbn:de:0030-drops-120639 https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.TQC.2020.4 eng https://creativecommons.org/licenses/by/3.0/legalcode