| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2010: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2009: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2008: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Research Abstract |
We studied information theoretically secure cryptosystems in order to make them more practical. As a result, we obtained three results along with this research direction. Three main results are : (1) coding theorems for (2,2)-threshold secret sharing schemes secure against cheaters, (2) a proposal of efficient visual secret sharing schemes by relaxing information theoretical security notion, and (3) a new look at relations among information theoretically secure and computationally secure symmetric key encryptions. Furthermore, we obtained several results in cryptography and information security in which information theoretic methods are effectively utilized.
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