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Author

Ryo Nishimaki

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Preprint Aug 2026

Towards the Impossibility of Imperfectly Complete Key Agreement in the QROM

We make progress towards the impossibility of quantum-computation, classical-communication (QCCC) key agreement by giving the first unconditional polynomial-query attacks that tolerate imperfect completeness in the following settings. First, we give a quantum attack on protocols with arbitrarily many rounds in which bo...

Fuyuki Kitagawa, Ryo Nishimaki, Ági Villányi et al. · 0 citations

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