| Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2014: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2013: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2012: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Outline of Final Research Achievements |
Under this grant, we studied the following two important applications of coding in cryptography: 1) Code-based cryptographic protocols, which are secure even against attacks with quantum computers (such the protocols are called “post-quantum”). We presented the first proof of plaintext knowledge for the code-based public-key encryption, and applied it to obtain the first code-based verifiable encryption and the first designated confirmer signature. 2) Secret sharing (SS) - an information security technology allowing us to achieve privacy by splitting the secret data into “shares” that can be stored in a distributed manner. We presented new cheater-identifiable SS schemes and new robust SS schemes secure against rushing cheaters with share sizes which are minimal up-to-date, among the constructions of the same class. Finally, we presented a verifiable share redistribution scheme with perfect security when the number of corrupt parties k<n/3, where n is the number of participants.
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