Non-malleability for quantum public-key encryption

Christian Majenz; Christian Schaffner; Jeroen van Wier

Paper 2019/496

Non-malleability for quantum public-key encryption

Christian Majenz, 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 cryptography non-malleability quantum cryptography
Contact author(s): jeroen vanwier @ uni lu
History: 2019-05-20: received
Short URL: https://ia.cr/2019/496
License: CC BY

BibTeX

@misc{cryptoeprint:2019/496,
      author = {Christian Majenz and Christian Schaffner and Jeroen van Wier},
      title = {Non-malleability for quantum public-key encryption},
      howpublished = {Cryptology {ePrint} Archive, Paper 2019/496},
      year = {2019},
      url = {https://eprint.iacr.org/2019/496}
}