| Project/Area Number |
12355017
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (A)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 展開研究 |
|---|
| Research Field |
情報通信工学
|
|---|
| Research Institution | The University of Tokyo |
|---|
Principal Investigator |
IMAI Hideki The University of Tokyo, The University of Tokyo Institute of Industrial Science Information and Systems, Professor (70017987)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
MATSUURA Kanta 東京大学, Institute of Industrial science Information and Systems, Lecturer (00292756)
KOBARA Kazukuni 東京大学, Institute of Industrial science Information and Systems, Research (70323649)
SASAKI Minoru 株式会社パンプキンハウス, R & D, Pumpkin House, Research
|
|---|
| Project Period (FY) |
2000 – 2001
|
| Project Status |
Completed (Fiscal Year 2001)
|
| Budget Amount *help |
¥30,490,000 (Direct Cost: ¥26,500,000、Indirect Cost: ¥3,990,000)
Fiscal Year 2001: ¥17,290,000 (Direct Cost: ¥13,300,000、Indirect Cost: ¥3,990,000)
Fiscal Year 2000: ¥13,200,000 (Direct Cost: ¥13,200,000)
|
|---|
| Keywords | Crypto-infrastructure / Cryptography / Information security / Digital signature / Hash function / Information theory / Secret sharing / ID based |
|---|
| Research Abstract |
This research project focuses on the unconditionally secure crypto-infrastructures, which guarantees the unforgeability of signatures or certificates issued under the crypto-infrastructures without any unproven computational assumptions. We successfully established a sound and strong notion for such crypto-infrastructures by carefully examining the more established security notions for digital signatures based on public-key cryptography, and by taking into account desirable requirements of signature schemes in the unconditional security setting. We also revealed an interesting relation among relevant security notions which have appeared in the unconditionally setting, and significantly, proved that our new security notion is the strongest among all those for unconditionally secure authentication and signature schemes known to date. Furthermore, we showed that our security notion encompasses that for public-key signature schemes, namely, existential unforgeability under adaptive chosen-message attack. Finally we proposed a concrete method to construction and manage such unconditionally secure crypto-infrastructures that meet our strongest security notion.
|
