| Project/Area Number |
26540056
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Information security
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| Research Institution | Yokohama National University |
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Principal Investigator |
SHIKATA JUNJI 横浜国立大学, 大学院環境情報研究院, 教授 (30345483)
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| Co-Investigator(Renkei-kenkyūsha) |
MATSUMOTO TSUTOMU 横浜国立大学, 大学院環境情報研究院, 教授 (40183107)
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| Project Period (FY) |
2014-04-01 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2016: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2015: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
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| Keywords | 暗号理論 / 情報量的安全性 / 高機能暗号 / 長期的安全性 / 暗号・認証等 / 情報理論的安全性 / 暗号 / 認証 / 計算量的安全性 |
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| Outline of Final Research Achievements |
In this research project, we investigated (im)possibility of coexistence of computational and information-theoretic security for advanced cryptographic systems with long-term security. Our approach is to analyze various computational or information-theoretic advanced functionalities in cryptographic systems by means of several mathematical structures, and such advanced functionalities include timed-release functionality, revocable functionality, and searchable functionality. In addition, the analysis results tell us that, in a cryptographic system in which computational and information-theoretic security coexist, it seems to be difficult to maintain long-term security only by information-theoretic security without any additional assumption if computational security is compromised.
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