| Budget Amount *help |
¥14,950,000 (Direct Cost: ¥11,500,000、Indirect Cost: ¥3,450,000)
Fiscal Year 2016: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Fiscal Year 2015: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Fiscal Year 2014: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2013: ¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000)
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| Outline of Final Research Achievements |
Pairing-based cryptography provides us new cryptographic protocols, which cannot be constructed by the conventional public-key cryptosystems. In this research project, we investigated the hardness of solving the discrete logarithm problem (DLP) over extension fields which is used for the security estimation of pairing-based cryptography. In particular, we evaluated the secure parameters of elliptic curves used for the pairing-based cryptography by considering the extended TNFS which is the asymptotically fastest algorithm for solving the DLP over extension fields. Moreover, we proposed several pairing-based cryptographic protocols such as anonymous hierarchical IBE with continual-key-leakage tolerance, revocable identity-based signcryption scheme, and so on.
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