Sunspot: A Decentralized Framework Enabling Privacy for Authorizable Data Sharing on Transparent Public Blockchains
Sunspot: A Decentralized Framework Enabling Privacy for Authorizable Data Sharing on Transparent Public Blockchains
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DOI：
10.1007/978-3-030-95384-3_43
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发表时间：
2021-11
期刊：
影响因子：
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通讯作者：
Yepeng Ding;Hiroyuki Sato
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文献类型：
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作者：
Yepeng Ding;Hiroyuki Sato
区块链技术一直在推动数据驱动的去中心化服务在各个领域的发展。然而，本着完全透明的精神，许多公共区块链将所有类型的数据公开给公众，例如以太坊。此外，大数据的链上持久化在技术和经济上都非常昂贵。这些问题导致难以共享相当大的私人数据，同时保留公共区块链有吸引力的特性。尽管链上数据持久性的直接加密可以引入机密性，但密钥共享、访问控制和合法权利证明等新挑战仍然存在。同时，尽管IPFS等去中心化存储系统带来了相当大的数据持久化的可能性，但跨链协作仍然需要安全有效的协议。在本文中，我们提出了 Sunspot，一种在透明公共区块链上进行隐私保护数据共享和访问控制的去中心化框架，以解决这些问题。我们还通过MyPub展示了Sunspot的实用性和适用性，MyPub是一个基于Sunspot的去中心化隐私保护发布平台。此外，我们通过理论分析和实验评估了太阳黑子的安全性和隐私性。
Blockchain technologies have been boosting the development of data-driven decentralized services in a wide range of fields. However, with the spirit of full transparency, many public blockchains expose all types of data to the public such as Ethereum. Besides, the on-chain persistence of large data is significantly expensive technically and economically. These issues lead to the difficulty of sharing fairly large private data while preserving attractive properties of public blockchains. Although direct encryption for on-chain data persistence can introduce confidentiality, new challenges such as key sharing, access control, and legal rights proving are still open. Meanwhile, cross-chain collaboration still requires secure and effective protocols, though decentralized storage systems such as IPFS bring the possibility for fairly large data persistence. In this paper, we propose Sunspot, a decentralized framework for privacy-preserving data sharing with access control on transparent public blockchains, to solve these issues. We also show the practicality and applicability of Sunspot by MyPub, a decentralized privacy-preserving publishing platform based on Sunspot. Furthermore, we evaluate the security and privacy of Sunspot through theoretical analysis and experiments.