Cryptology ePrint Archive: Report 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.

Category / Keywords: public-key cryptography / public-key cryptography, non-malleability, quantum cryptography

Date: received 14 May 2019

Contact author: jeroen vanwier at uni lu

Available format(s): PDF | BibTeX Citation

Version: 20190520:122922 (All versions of this report)

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