2010 Fiscal Year Final Research Report
Coding Theorems for Information-Theoretically Secure Systems with Stochastic Encoders
| Project/Area Number |
20500004
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Fundamental theory of informatics
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| Research Institution | University of Tsukuba |
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Principal Investigator |
KOGA Hiroki University of Tsukuba, 大学院・システム情報工学研究科, 准教授 (20272388)
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| Project Period (FY) |
2008 – 2010
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| Keywords | 情報理論的安全性 / 確率的符号器 / 秘密分散法 / 電子指紋 |
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| Research Abstract |
In this study we analyzed information systems with stochastic encoders and developed new results. First, we established novel coding theorems for Shannon's cipher system with a general source, where an encoder of the system can be stochastic. We also proposed a new simple n-out-of-n threshold scheme that is secure against a substitution attack by shareholders. In addition, we considered a digital fingerprinting code for copyright protection using a finite projective plane and obtained conditions under which all the malicious users are identifiable from a pirated content.
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