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T. Iwata

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Open access Oct 2026

Provable Post-Quantum Security of the 3-Round Substitution-Permutation Network

Substitution-Permutation Networks (SPNs) constitute a major design paradigm for block ciphers. While the provable security of generic SPNs has been studied in the classical setting, their security against quantum adversaries remains largely unexplored. In this work, we provide the first provable security result for a...

Rentaro Shiba, T. Iwata · 0 citations
Open access Aug 2026

Black-Box Construction of Partial Key Exposure Resilient Symmetric-Key Encryption Scheme

By utilizing any secure symmetric-key encryption scheme as a black-box primitive, this paper demonstrates a method for constructing a symmetric-key encryption scheme that remains secure even in the presence of partial key leakage.

Reo Eriguchi, T. Iwata, Goichiro Hanaoka et al. · 0 citations

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