| Budget Amount *help |
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2013: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2012: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2011: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Research Abstract |
In this research, we investigated the way of detecting cheating in information theoretic cryptography. In particular, we clarified that the trade-off between share size and the exponent of the success probability in impersonation attack on (2,2)-threshold secret sharing schemes. This result implies how we can easily detect the impersonation by making each share redundant. In addition, we proposed a method of preventing the cheating in visual secret sharing schemes (VSSS). We also discussed how to cheat the visual secret sharing schemes in a practical setting by focusing on the situation where VSSS is decrypted without computers. Other than the above, we clarified several fundamental results on information theoretic cryptography.
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