(Tightly) QCCA-Secure Key-Encapsulation Mechanism in the Quantum Random Oracle Model

  • Keita XagawaEmail author
  • Takashi Yamakawa
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 11505)


This paper studies indistinguishability against quantum chosen-ciphertext attacks (IND-qCCA security) of key-encapsulation mechanisms (KEMs) in quantum random oracle model (QROM). We show that the SXY conversion proposed by Saito, Yamakawa, and Xagawa (EUROCRYPT 2018) and the HU conversion proposed by Jiang, Zhang, and Ma (PKC 2019) turn a weakly-secure deterministic public-key encryption scheme into an IND-qCCA-secure KEM scheme in the QROM. The proofs are very similar to that for the IND-CCA security in the QROM, easy to understand, and as tight as the original proofs.


Tight security Quantum chosen-ciphertext security Post-quantum cryptography KEM 



We would like to thank Haodong Jiang and anonymous reviewers of PQCrypto 2019 for insightful comments.


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Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  1. 1.NTT Secure Platform LaboratoriesMusashino-shiJapan

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