| Budget Amount *help |
¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Fiscal Year 2013: ¥260,000 (Direct Cost: ¥200,000、Indirect Cost: ¥60,000)
Fiscal Year 2012: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2011: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2010: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
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| Research Abstract |
Robust Log storage based on P2P network can be constructed by building tamper resistant log storage system on a P2P distributed file system. Each log message are first converted into several shares by secret sharing scheme. Then each share are encrypted with symmetric searchable encryption (SSE) scheme and then stored on some P2P nodes. Since P2P nodes could not assumed to be honest, we need a scheme which can verify that each node followed the scheme correctly. We proposed a verifiable SSE scheme and a verifiable dynamic SSE scheme. We've implemented prototype system. We found that the dynamic scheme require very high computation cost on each peer, and thus it is not yet feasible for practical use.
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