| Budget Amount *help |
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2011: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2010: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2009: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
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| Research Abstract |
In order to discuss the possibility of generic constructions of CCA-secure public-key encryption schemes from CPA-secure schemes, we extended adversary models. Based on the extended models, we defined intermediate securities between CPA and CCA, and presented some corresponding particular generic constructions. In addition, by using an economic model which can interpret the significance of such schemes, we proposed a framework of choosing cryptographic modules.
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