| 研究課題/領域番号 |
21K13830
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| 研究種目 |
若手研究
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| 配分区分 | 基金 |
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| 審査区分 |
小区分12030:数学基礎関連
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| 研究機関 | 九州大学 |
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研究代表者 |
顧 玉杰 九州大学, システム情報科学研究院, 助教 (50898731)
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| 研究期間 (年度) |
2021-04-01 – 2024-03-31
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| 研究課題ステータス |
交付 (2022年度)
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| 配分額 *注記 |
4,680千円 (直接経費: 3,600千円、間接経費: 1,080千円)
2023年度: 1,430千円 (直接経費: 1,100千円、間接経費: 330千円)
2022年度: 1,560千円 (直接経費: 1,200千円、間接経費: 360千円)
2021年度: 1,690千円 (直接経費: 1,300千円、間接経費: 390千円)
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| キーワード | copyright protection / traitor tracing / code rate / decoding algorithm / list decoding / fingerprinting code / dynamic traitor tracing / multimedia IPP code / secure code / collusion attack / probabilistic method / dynamic tracing / Broadcast Encryption / Traitor Tracing / Key Assignment Scheme / Combinatorial Method / Identifying Algorithm |
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| 研究開始時の研究の概要 |
Digital media plays a key role in our daily life. Protection against digital content copyright violation is an important but difficult challenge. The traitor tracing method provides an effective way to resist collusion attacks of illegal key redistribution for broadcast encryption. The objective of this project is to analyze and construct traitor tracing key assignment schemes using combinatorial methods, and to build efficient tracing algorithms by virtue of coding-theoretic techniques.
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| 研究実績の概要 |
Traitor tracing is a mathematical approach of protecting copyright of digital content against collusion attacks. This project studies combinatorial secure codes for traitor tracing, with particular focus on exploring their maximum code rate and identifying algorithms. The obtained results are as follows. 1) A new unified concept of secure codes with list decoding (SCLDs) is proposed by integrating the idea of list decoding into secure codes with complete traceability; 2) Bounds on the maximum code rate of SCLDs are derived via the probabilistic method; 3) A two-step decoding algorithm is established for SCLDs, whose efficiency outperforms the known separable codes; 4) A two-stage dynamic framework is proposed for dynamic traitor tracing; 5) New bounds on the maximum code rate of binary multimedia IPP codes are established.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
2: おおむね順調に進展している
理由
The project is conducted as planned and goes smoothly. Regarding the secure codes for traitor tracing, new results on both their maximum code rate and decoding algorithms are established, as desired. The obtained results have been summarized for publishing in domestic and international conferences and journals.
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| 今後の研究の推進方策 |
We will further explore the trade-off between the code rate and decoding efficiency of secure codes for traitor tracing in terms of their combinatorial properties. Furthermore, we will consider the traitor tracing in the more realistic noisy scenario and attempt to establish a noise-resistant traitor tracing model by combining the combinatorial secure codes and the statistical analysis techniques.
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