| Budget Amount *help |
¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2017: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2016: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2015: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
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| Outline of Final Research Achievements |
We have proposed a new secret sharing scheme realizing general access structures. The proposed scheme can reduce the number of shares distributed to one specified participant. We can apply the proposed scheme to the same access structure recursively. That is, the proposed scheme can reduce the number of shares distributed to another participant once again by applying the proposed scheme recursively.
Next, we have proposed new secret sharing schemes realizing general access structures. This scheme can reduce the number of shares distributed to specified participants. Thus, we can reduce the number of shares distributed to any participant who belongs to the selected subset.
Furthermore, we have proposed a new secret sharing scheme realizing general access structures. In the proposed scheme, shares are generated by Tassa's hierarchical threshold scheme instead of Shamir's threshold scheme. Thus, the proposed scheme can reduce the number of shares distributed to each participant.
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