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Author

Ryo Nishimaki

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2 papers indexed here

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Preprint Sep 2026

Quantum Leakage Resilience of Shamir Secret Sharing

We initiate the study of quantum leakage resilience of unmodified Shamir secret sharing over prime fields. A well-studied leakage model for Shamir's secret sharing classically is single-bit local leakage from each share. We consider its quantum analogue where, for each party, a local leakage channel takes as input the...

Rishabh Batra, Fuyuki Kitagawa, Ryo Nishimaki et al. · 1 citation · ⚡1
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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