2023 Fiscal Year Final Research Report
Optimal Secret Sharing for Proactive Access Structures
| Project/Area Number |
19K11835
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 60010:Theory of informatics-related
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| Research Institution | National Institute of Information and Communications Technology |
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Principal Investigator |
Yoshida Maki 国立研究開発法人情報通信研究機構, サイバーセキュリティ研究所, 主任研究員 (50335387)
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| Project Period (FY) |
2019-04-01 – 2024-03-31
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| Keywords | 秘密分散 / 最適 / アクセス構造 |
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| Outline of Final Research Achievements |
Based on the previous definition of secret sharing and the major requirements of cryptographic applications, we extended the definition so that an access structure allows updating of the security level including not only the monotonous structures but also non-monotone access structures. This expands the range of cryptographic applications. Expanded. We also confirmed the feasibility of optimality in conventional and new cryptographic applications while ensuring important properties (correctness and verifiability) and essential properties for cryptographic applications.
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| Free Research Field |
情報セキュリティ
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| Academic Significance and Societal Importance of the Research Achievements |
本研究の学術的意義は，暗号応用に不可欠な各種特性の担保とシェアサイズの最小化の達成である．社会的意義は，それにより秘密鍵を復元することなく分散したままで電子署名や秘密計算など処理が可能になり，秘密鍵が晒されるリスクを削減したことである．
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