Founding Secure Computation on Blockchains
Founding Secure Computation on Blockchains
复制标题
在区块链上建立安全计算
DOI:
10.1007/978-3-030-17656-3_13
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发表时间:
2019
期刊:
影响因子:
--
通讯作者:
Jain, Abhishek
中科院分区:
文献类型:
--
作者:
Chouchuri, Arka Rai;Goel, Vipul;Jain, Abhishek
We study the foundations of secure computation in theblockchain-hybrid model, where a blockchain – modeled as aglobalfunctionality – is available as an Oracle to all the participants of a cryptographic protocol. We demonstrate both destructive and constructive applications of blockchains:We show that classical rewinding-based simulation techniques used in many security proofs fail againstblockchain-activeadversaries that have read and post access to a global blockchain. In particular, we show that zero-knowledge (ZK) proofs with black-box simulation are impossible against blockchain-active adversaries.Nevertheless, we show that achieving security against blockchain-active adversaries is possible if the honest parties are also blockchain active. We construct an-round ZK protocol with black-box simulation. We show that this result is tight by proving the impossibility of constant-round ZK with black-box simulation.Finally, we demonstrate a novel application of blockchains to overcome the known impossibility results for concurrent secure computation in the plain model. We construct a concurrent self-composable secure computation protocol for general functionalities in the blockchain-hybrid model based on standard cryptographic assumptions.We develop a suite of techniques for constructing secure protocols in the blockchain-hybrid model that we hope will find applications to future research in this area.
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DOI:
10.1007/978-3-642-32009-5_25
发表时间:
2012
期刊:
2012 IEEE 53rd Annual Symposium on Foundations of Computer Science
影响因子:
--
作者:
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期刊:
--
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影响因子:
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DOI:
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发表时间:
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期刊:
Journal of Physics D
影响因子:
--
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