| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2010: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2009: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2008: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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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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