Post-Quantum Security of Key Encapsulation Mechanism against CCA Attacks with a Single Decapsulation Query

ePrint Report: Post-Quantum Security of Key Encapsulation Mechanism against CCA Attacks with a Single Decapsulation Query

Haodong Jiang, Zhi Ma, Zhenfeng Zhang

Recently, in post-quantum cryptography migration, it has been shown that an IND-1-CCA-secure key encapsulation mechanisms (KEM) is required for replacing an ephemeral Diffie-Hellman (DH) in widely-used protocols, e.g., TLS, Signal, and Noise. IND-1-CCA security is a notion similar to the traditional IND-CCA security except that the adversary is restricted to one single decapsulation query. At EUROCRYPT 2022, based …

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