| Project/Area Number |
23650008
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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 |
Fundamental theory of informatics
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| Research Institution | Kyushu University |
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Principal Investigator |
SAKURAI Kouichi 九州大学, システム情報科学研究院, 教授 (60264066)
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| Project Period (FY) |
2011 – 2012
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| Project Status |
Completed (Fiscal Year 2012)
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| Budget Amount *help |
¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2012: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2011: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
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| Keywords | 暗号理論 / 一方向性関数 / 疑似乱数生成 / 計算理論 / Diffie-Hellmann 問題 / 暗号プロトコル / 堅固性 / 安全性評価 / 計算量理論 / Deffie-Hellmann問題 / 擬似乱数生成 / Diffie-Hellmann問題 |
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| Research Abstract |
We succeed to construct an explicit pair ofcomputationally independent one-way functions from the hardness of the discrete logarithm problem. Our proof argument is based on the square Deffie-Hellmann problem. This main result is presented in Symposium of Cryptography and Information Security 2013 . Also we get a joint researcher, Prof. Yunlei ZHAO (Fudan Univ. China) who was visiting in Singapore Management Univ. when Kouichi SAKURAI has visited the security lab. His suggestion issome relationship between non-malleability of functions and our notion of computationally independent one-way functions. Prof. Yunlei ZHAO has visited Kyushu Univ. from Sept 2012 for 6 months thanks to NICT’s inviting program of foreign researcher to Japan, and we perform joint research on this topic including cryptographic key exchange protocols, a partial result of which is presented also in Symposium of Cryptography and Information Security 2013.
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