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Paper 2019/496

Non-malleability for quantum public-key encryption

Christian Majenz and Christian Schaffner and Jeroen van Wier

Abstract

Non-malleability is an important security property for public-key encryption (PKE). Its significance is due to the fundamental unachievability of integrity and authenticity guarantees in this setting, rendering it the strongest integrity-like property achievable using only PKE, without digital signatures. In this work, we generalize this notion to the setting of quantum public-key encryption. Overcoming the notorious "recording barrier" known from generalizing other integrity-like security notions to quantum encryption, we generalize one of the equivalent classical definitions, comparison-based non-malleability, and show how it can be fulfilled. In addition, we explore one-time non-malleability notions for symmetric-key encryption from the literature by defining plaintext and ciphertext variants and by characterizing their relation.

Metadata
Available format(s)
PDF
Category
Public-key cryptography
Publication info
Preprint.
Keywords
public-key cryptographynon-malleabilityquantum cryptography
Contact author(s)
jeroen vanwier @ uni lu
History
2019-05-20: received
Short URL
https://ia.cr/2019/496
License
Creative Commons Attribution
CC BY
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