Cryptology ePrint Archive: Report 2018/838

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

Keita Xagawa and Takashi Yamakawa

Abstract: This paper shows the security against quantum chosen-ciphertext attacks (QCCA security) of the KEM in Saito, Yamakawa, and Xagawa (EUROCRYPT 2018) in the QROM. The proof is very similar to that for the CCA security in the QROM, easy to understand, and as tight as the original proof.

Category / Keywords: public-key cryptography / Tight security, quantum chosen-ciphertext security, post-quantum cryptography, KEM

Date: received 5 Sep 2018, last revised 18 Oct 2018

Contact author: xagawa keita at lab ntt co jp

Available format(s): PDF | BibTeX Citation

Note: Correct errors on inaccurate keys and references.

Version: 20181019:043456 (All versions of this report)

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