| Project/Area Number |
12480073
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
計算機科学
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| Research Institution | KYUSHU UNIVERSITY |
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Principal Investigator |
SAKURAI Kouichi Kyushu University, Faculty of Information Science and Electrical Engineering, Prof., 大学院・システム情報科学研究院, 教授 (60264066)
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| Co-Investigator(Kenkyū-buntansha) |
SATOH Takashi The University of Kitakyushu, Faculty of Environmental Engineering,Associate Prof., 国際環境工学部, 助教授 (30262281)
ASAHIRO Yuichi Kyushu Sangyo University, Department of Social Information Systems, Faculty of Information Science, Associate Prof., 情報科学部, 助教授 (40304761)
YAMASHITA Masafumi Kyushu University, Faculty of Information Science and Electrical Engineering, Prof., 大学院・システム情報科学研究院, 教授 (00135419)
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| Project Period (FY) |
2000 – 2002
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| Project Status |
Completed (Fiscal Year 2002)
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| Budget Amount *help |
¥7,200,000 (Direct Cost: ¥7,200,000)
Fiscal Year 2002: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 2001: ¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 2000: ¥3,800,000 (Direct Cost: ¥3,800,000)
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| Keywords | Cryptography / Information Security / Electronic Money / Electronic Auction / Privacy Protection / Distributed Cryptography / Anonymity / Public-Key Cryptography |
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| Research Abstract |
A Public Key Infrastructure (PKI) is the one of the important techniques to support secure E-commerce and digital communication on networks. Many PKI trust models have been proposed and are widely used for various purposes.
We consider two trust models: A Single CA model and A Subordinated Hierarchical model. The trust model that one Certification Authority (CA) issues all certificates is the simplest one. We call it "A Single CA model". In this model, construction and validation processes of certification path are very simple, however it is attended with danger of the high ratio of exposure CA's secret key. The subordinated hierarchical model mitigated this problem. For this reason, a subordinated hierarchical model is very popular in the real world. In this research, we discuss the advantages and disadvantages of these two models and suggest the PKI trust model that certificate path is shorter than one of a subordinated hierarchical model by using the forward-secure digital signature scheme.
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