Improvement of Winternitz OTS with a Novel Fingerprinting Function

Motonari Honda; Yuichi Kaji

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Paper

Improvement of Winternitz OTS with a Novel Fingerprinting Function

Topics: Applied Cryptography; Data Integrity; Formal Methods for Security

In Proceedings of the 20th International Conference on Security and Cryptography SECRYPT - Volume 1, 303-311, 2023 , Rome, Italy

Authors: Motonari Honda and Yuichi Kaji

Affiliation: Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8601, Japan

Keyword(s): Winternitz OTS, Hash-Based Signature, Post-Quantum Security, Fingerprinting Function, Security Proof.

Abstract: Winternitz one-time signature (OTS) plays a core role in practical hash-based digital signature schemes including SPHINCS+, one of PQC standardizations selected by NIST. This study focuses on the security mechanism of Winternitz OTS and improves the scheme by introducing a novel fingerprinting function. The proposed scheme has provable security of strongly existential unforgeability and reduces by about 10% of the computational costs for operations in Winternitz OTS. The improvement is combinable with other investigations such as WOTS+, and gives the contribution to the study of practical quantum secure digital signatures.

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Paper citation in several formats:

Honda, M. and Kaji, Y. (2023). Improvement of Winternitz OTS with a Novel Fingerprinting Function. In Proceedings of the 20th International Conference on Security and Cryptography - SECRYPT; ISBN 978-989-758-666-8; ISSN 2184-7711, SciTePress, pages 303-311. DOI: 10.5220/0012049100003555

@conference{secrypt23,
author={Motonari Honda. and Yuichi Kaji.},
title={Improvement of Winternitz OTS with a Novel Fingerprinting Function},
booktitle={Proceedings of the 20th International Conference on Security and Cryptography - SECRYPT},
year={2023},
pages={303-311},
publisher={SciTePress},
organization={INSTICC},
doi={10.5220/0012049100003555},
isbn={978-989-758-666-8},
issn={2184-7711},
}

TY - CONF

JO - Proceedings of the 20th International Conference on Security and Cryptography - SECRYPT
TI - Improvement of Winternitz OTS with a Novel Fingerprinting Function
SN - 978-989-758-666-8
IS - 2184-7711
AU - Honda, M.
AU - Kaji, Y.
PY - 2023
SP - 303
EP - 311
DO - 10.5220/0012049100003555
PB - SciTePress