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I've been reading "Misuse Attacks on Post-Quantum Cryptosystems" (https://eprint.iacr.org/2019/525). In what scenarios are the attacks described in the paper applicable? Is it specifically if a key is reused to generate more than one encapsulated key? Or is it more general? Does it apply to all 'unfailing' reconciliation mechanisms?

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  • $\begingroup$ According to the abstract, at least one of the claimed attack indeed is quantum: "In the latter case, we assume quantum access to the decryption oracle." $\endgroup$
    – fgrieu
    Jul 25, 2023 at 17:30
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    $\begingroup$ The paper covers a classical KR-PCA attacks and two quantum KR-CCA attacks (GKZ and AJOP based). I'm curious about all of them, so I'll edit the title. $\endgroup$ Jul 25, 2023 at 21:28

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