| Budget Amount *help |
¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2017: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2016: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2015: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
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| Outline of Final Research Achievements |
We propose attibute-based aggregate signatures. We introduce a formal definition and framework of attibute-based aggregate signatures and its security models, and also construct a concrete scheme which satisfies the definition and the security of attibute-based aggregate signatures.
Additionally, we consider several conditions so that signature schemes achieve the provable security which is the standard security notion in the modern cryptography. We give some impossibilities on proving the security of signature scheme, and also give several constructions of signature scheme to avoid such impossibility results and have high security.
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