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        <identifier>oai:ipsj.ixsq.nii.ac.jp:00227043</identifier>
        <datestamp>2025-01-19T12:17:45Z</datestamp>
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          <dc:title>安全性帰着がタイトな同種写像に基づくIDベース署名方式</dc:title>
          <dc:title>An Identity-based Signature Scheme with Tight Security Reduction</dc:title>
          <dc:creator>陳, 加偉</dc:creator>
          <dc:creator>趙, 亨騄</dc:creator>
          <dc:creator>佐藤, 慎悟</dc:creator>
          <dc:creator>四方, 順司</dc:creator>
          <dc:creator>Jiawei, Chen</dc:creator>
          <dc:creator>Hyungrok, Jo</dc:creator>
          <dc:creator>Shingo, Sato</dc:creator>
          <dc:creator>Junji, Shikata</dc:creator>
          <dc:subject>ISEC</dc:subject>
          <dc:description>本論文では，超特異楕円曲線の同種写像問題に基づく，安全性帰着がタイトな ID ベース署名 (Identity-based Signature, IBS) 方式を提案する．既存方式として Shaw とDutta によって同種写像ベース IBS の直接的な構成が提案されたが，その安全性証明はタイトでない．これを改善するため，タイトな安全性を達成する同種写像ベース署名方式 Lossy CSI-FiSh を用いる．Lossy CSI-FiSh に基づいた IBS 方式を提案し，この方式に対してタイトな安全性証明を示す．さらに，適切なパラメータ設定の下で鍵サイズと署名サイズの比較・解析を行う．</dc:description>
          <dc:description>In this paper, we propose an identity-based signature (IBS) scheme based on the supersingular isogeny problem, with tightly security reduction. While Shaw and Dutta have proposed a direct construction of isogeny-based IBS as an existing scheme, its security proof is not tight. To address this issue, we utilize a tightly secure isogeny-based signature scheme Lossy CSI-FiSh. We present an IBS scheme based on the Lossy CSI-FiSh scheme and provide a tight security proof for this scheme. Furthermore, we conduct a comparative analysis of key size and signature size for the isogeny-based IBS scheme under suitable parameter settings. The full version of this paper will be appeared in the proceedings of the 14th International Conference on Post-Quantum Cryptography (PQCrypto 2023).</dc:description>
          <dc:description>technical report</dc:description>
          <dc:publisher>情報処理学会</dc:publisher>
          <dc:date>2023-07-17</dc:date>
          <dc:format>application/pdf</dc:format>
          <dc:identifier>研究報告セキュリティ心理学とトラスト（SPT）</dc:identifier>
          <dc:identifier>36</dc:identifier>
          <dc:identifier>2023-SPT-52</dc:identifier>
          <dc:identifier>1</dc:identifier>
          <dc:identifier>8</dc:identifier>
          <dc:identifier>2188-8671</dc:identifier>
          <dc:identifier>AA12628305</dc:identifier>
          <dc:identifier>https://ipsj.ixsq.nii.ac.jp/record/227043/files/IPSJ-SPT23052036.pdf</dc:identifier>
          <dc:language>jpn</dc:language>
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