Quantum non-malleability and authentication

Gorjan Alagic, Christian Majenz*

*Corresponding author af dette arbejde

Publikation: Bidrag til bog/antologi/rapportKonferencebidrag i proceedingsForskningpeer review

13 Citationer (Scopus)

Abstract

In encryption, non-malleability is a highly desirable property: it ensures that adversaries cannot manipulate the plaintext by acting on the ciphertext. In [6], Ambainis et al. gave a definition of non-malleability for the encryption of quantum data. In this work, we show that this definition is too weak, as it allows adversaries to “inject” plaintexts of their choice into the ciphertext. We give a new definition of quantum non-malleability which resolves this problem. Our definition is expressed in terms of entropic quantities, considers stronger adversaries, and does not assume secrecy. Rather, we prove that quantum non-malleability implies secrecy; this is in stark contrast to the classical setting, where the two properties are completely independent. For unitary schemes, our notion of non-malleability is equivalent to encryption with a two-design and hence also to the. Our techniques also yield new results regarding the closely-related task of quantum authentication. We show that “total authentication” (a notion recently proposed by Garg et al. [6],) can be satisfied with two-designs, a significant improvement over the eight-design construction of [18],. We also show that, under a mild adaptation of the rejection procedure, both total authentication and our notion of non-malleability yield quantum authentication as defined by Dupuis et al. [16].

OriginalsprogEngelsk
TitelAdvances in Cryptology – CRYPTO 2017 - 37th Annual International Cryptology Conference, Proceedings
RedaktørerJonathan Katz, Hovav Shacham
Antal sider32
Vol/bind2
ForlagSpringer VS
Publikationsdato1 jan. 2017
Sider310-341
ISBN (Trykt)9783319637143
DOI
StatusUdgivet - 1 jan. 2017
Begivenhed37th Annual International Cryptology Conference, CRYPTO 2017 - Santa Barbara, USA
Varighed: 20 aug. 201724 aug. 2017

Konference

Konference37th Annual International Cryptology Conference, CRYPTO 2017
Land/OmrådeUSA
BySanta Barbara
Periode20/08/201724/08/2017
NavnLecture notes in computer science
Vol/bind10402
ISSN0302-9743

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