| Budget Amount *help |
¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000)
Fiscal Year 2016: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2015: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2014: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2013: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2012: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
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| Outline of Final Research Achievements |
In this research, we study broadcast encryption using bilinear pairing. In our scheme, a sender encrypts data using his private key. This allows the receiver to authenticate the sender and the message. Furthermore, we consider the efficient signature scheme combining both functions of 1-out-of-n signatures and designated-verifier signatures.
We also study CAPTCHA to use the fundamental technique of anonymous authentication. The current CAPTCHA mainly uses perceptual recognition with images or sounds, but it is difficult for visually or hearing-impaired people to leverage it. We propose a new identification scheme. Our scheme uses a verbal question which is identification of natural sentences and word salads. We generate natural sentences as word salads which are generated by the Markov chain with multi-state. Such sentences are generated almost unbounded volume by using online documents and it is hard for adversaries to find them by search engine.
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