ShadowEth: Private Smart Contract on Public Blockchain

ShadowEth: Private Smart Contract on Public Blockchain
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ShadowEth:公共区块链上的私人智能合约

DOI:
10.1007/s11390-018-1839-y
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发表时间:
2018-05
影响因子:
0.7
通讯作者:
Xie Jan
Xie Jan
中科院分区:
--
文献类型:
--
作者:
Yuan Rui;Xia Yu Bin;Chen Hai Bo;Zang Bin Yu;Xie Jan

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区块链作为一种分布式和可靠的分类账越来越受欢迎,它允许不信任的各方在不信任第三方的情况下安全地进行交易。像以太坊这样的新兴区块链系统支持智能合约,矿工可以运行任意用户定义的程序。然而,区块链和智能合约最大的担忧之一是隐私,因为链上的所有交易都是公开的。在本文中,我们介绍了ShadowEth,这是一个利用硬件飞地来确保智能合约机密性的系统,同时保持基于以太坊等现有公共区块链的完整性和可用性。ShadowEth建立了一个由可信执行环境(TEE)保护的机密和安全平台,用于执行和存储私人合同。它只是将验证过程放在区块链上。我们提供了我们的系统设计,包括密码通信和验证协议,并通过各种案例研究显示ShadowEth的适用性和可行性。我们使用英特尔SGX在以太坊网络上实现了一个原型,并分析了系统的安全性和可用性。
Blockchain is becoming popular as a distributed and reliable ledger which allows distrustful parties to transact safely without trusting third parties. Emerging blockchain systems like Ethereum support smart contracts where miners can run arbitrary user-defined programs. However, one of the biggest concerns about the blockchain and the smart contract is privacy, since all the transactions on the chain are exposed to the public. In this paper, we present ShadowEth, a system that leverages hardware enclave to ensure the confidentiality of smart contracts while keeping the integrity and availability based on existing public blockchains like Ethereum. ShadowEth establishes a confidential and secure platform protected by trusted execution environment (TEE) off the public blockchain for the execution and storage of private contracts. It only puts the process of verification on the blockchain. We provide a design of our system including a protocol of the cryptographic communication and verification and show the applicability and feasibility of ShadowEth by various case studies. We implement a prototype using the Intel SGX on the Ethereum network and analyze the security and availability of the system.
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