ETHTID：以太坊上可部署的阈值信息披露
ETHTID: Deployable Threshold Information Disclosure on Ethereum
摘要：
我们解决了以太坊上的阈值信息披露（TID）问题：当且仅当所有这些消息都被披露时，任意数量的用户承诺按计划披露他们在以太坊区块链上记录的个人消息。在披露之前，只有每条消息的原始发送者应该知道其内容。为了实现这一点，我们的任务是一个小的理事会执行分布式生成和阈值共享的非对称密钥对。公钥可用于加密消息，该消息仅在阈值共享解密密钥在预定义的时间点被重构并记录在链上时才变得可读。有了像以太坊这样的区块链，就有可能协调这些程序，并为参与者的行为附加经济利益。在本文中，我们介绍了ETHTID，这是一个以太坊智能合约应用程序，用于协调阈值信息披露。我们的实现基于ETHDKG [1]，一个用于分布式密钥生成和阈值共享的智能合约应用程序，并对其进行调整以适应我们不同的用例，并添加功能来监督解密密钥的预定重建。对于我们的主要成本节约优化，我们表明，底层的加密方案的安全性保持。我们评估了执行成本如何取决于理事会的规模和阈值，并表明所提出的协议可在以太坊上部署，理事会超过200名成员，与ETHDKG相比节省了20-40%的天然气。
英文摘要：
We address the Threshold Information Disclosure (TID) problem on Ethereum: An arbitrary number of users commit to the scheduled disclosure of their individual messages recorded on the Ethereum blockchain if and only if all such messages are disclosed. Before a disclosure, only the original sender of each message should know its contents. To accomplish this, we task a small council with executing a distributed generation and threshold sharing of an asymmetric key pair. The public key can be used to encrypt messages which only become readable once the threshold-shared decryption key is reconstructed at a predefined point in time and recorded on-chain. With blockchains like Ethereum, it is possible to coordinate such procedures and attach economic stakes to the actions of participating individuals. In this paper, we present ETHTID, an Ethereum smart contract application to coordinate Threshold Information Disclosure. We base our implementation on ETHDKG [1], a smart contract application for distributed key generation and threshold sharing, and adapt it to fit our differing use case as well as add functionality to oversee a scheduled reconstruction of the decryption key. For our main cost saving optimisation, we show that the security of the underlying cryptographic scheme is maintained. We evaluate how the execution costs depend on the size of the council and the threshold and show that the presented protocol is deployable on Ethereum with a council of more than 200 members with gas savings of 20-40% compared to ETHDKG.
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