| Budget Amount *help |
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2010: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2009: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2008: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
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| Research Abstract |
In this study, we first proposed static security definitions against inference attacks on databases, based on a concept of "query resolution". Inference attacks mean that an attacker tries to infer the execution result of a query unauthorized to the attacker from the execution results of queries authorized to the attacker. Then, we focused on conjunctive queries and showed some properties of query resolution. Moreover, under some assumptions, we proposed decidable necessary and sufficient conditions for existence of resolution relation between two conjunctive queries.
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