Jeroen van Wier

We present a definition for non-malleability in the setting of public-key quantum cryptography. 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 further explore one-time non-malleability notions for symmetric-key quantum encryption known from the literature by defining plaintext and ciphertext variants and characterizing their relation. To show satisfiability of our presented definition, we use these refined one-time notions, as well as a post-quantum CNM scheme, to construct a hybrid scheme.