SaTC: CORE: Small: Collaborative: A Broad Treatment of Privacy in Blockchains

SaTC：核心：小型：协作：区块链中隐私的广泛处理

• 批准号: 1717067
• 负责人: Foteini Baldimtsi
• 金额: $ 25万
• 依托单位: George Mason University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2017
• 资助国家: 美国
• 起止时间: 2017-09-01 至 2022-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1717067&HistoricalAwards=false
• 关键词: SaTC; CORE; Small; Collaborative; Broad

Blockchains provide a new perspective on secure, decentralized information sharing and are projected to be the technology of the future. Blockchains were first introduced as the underlying mechanism of cryptocurrencies and are used to secure financial transactions without the need for a central trusted party. Today, blockchains are also recognized for their potential advantages in various contexts ranging from identity management to health data records. However, despite being such a promising tool, the data posted on a blockchain is public and immortally captured and thus the privacy of the users can be massively violated if privacy concerns are not taken into consideration. The goals of this project are to develop a formal model for privacy in blockchains and privacy-preserving tools.This project develops a framework that captures privacy requirements for transactions, data blocks and the mining process under a threat model that reflects the adversarial capabilities over the Internet (i.e., composable security). Building on this framework, the researchers investigate new privacy-preserving mechanisms for existing blockchain payment systems and the design of new blockchain-based payment systems with built-in privacy properties that do not require a trusted setup. Next, the researchers investigate new privacy requirements like hiding the identity of the miner which is relevant in scenarios where mining a block might signify the endorsement of the information included in the block. Finally, the researchers develop techniques to guarantee accountability even in a privacy-preserving setting where privacy should be preserved only so long as a pre-specified bad behavior is not detected.

区块链为安全、分散的信息共享提供了一个新的视角，预计将成为未来的技术。区块链最初是作为加密货币的底层机制引入的，用于确保金融交易的安全，而不需要中央可信方。今天，区块链也因其在从身份管理到健康数据记录等各种环境中的潜在优势而得到认可。然而，尽管区块链是一个很有前途的工具，但发布在区块链上的数据是公开的，并且会被永久捕获，因此，如果不考虑隐私问题，用户的隐私可能会被大量侵犯。该项目的目标是在区块链和隐私保护工具中开发一个正式的隐私模型。该项目开发了一个框架，该框架在一个反映互联网上的对抗能力（即可组合安全性）的威胁模型下捕获交易、数据块和挖掘过程的隐私需求。在此框架的基础上，研究人员研究了现有区块链支付系统的新隐私保护机制，并设计了新的基于区块链的支付系统，该系统具有内置的隐私属性，不需要可信的设置。接下来，研究人员调查了新的隐私要求，比如隐藏矿工的身份，这在挖掘区块可能意味着认可区块中包含的信息的情况下是相关的。最后，研究人员开发了一种技术，即使在隐私保护环境下，只要没有检测到预先指定的不良行为，隐私就应该得到保护，从而保证问责制。

项目成果

Crowd Verifiable Zero-Knowledge and End-to-End Verifiable Multiparty Computation

人群可验证的零知识和端到端可验证的多方计算

• 发表时间: 2020
• 期刊: Advances in Cryptology – ASIACRYPT 2020
• 作者: Baldimtsi, F.;Kiayias, A.;Zacharias;T., Zhang
• 通讯作者: T., Zhang

Leakage-resilient lattice-based partially blind signatures

• DOI: 10.1049/iet-ifs.2019.0156
• 发表时间: 2019-07
• 期刊: IET Inf. Secur.
• 作者: Dimitrios Papachristoudis;D. Hristu-Varsakelis;Foteini Baldimtsi;G. Stephanides

Batching, Aggregation, and Zero-Knowledge Proofs in Bilinear Accumulators

• DOI: 10.1145/3548606.3560676
• 发表时间: 2022-11
• 期刊: Proceedings of the 2022 ACM SIGSAC Conference on Computer and Communications Security
• 作者: Shravan Srinivasan;Ioanna Karantaidou;Foteini Baldimtsi;Charalampos Papamanthou

SoK: Blockchain Light Clients

• DOI: 10.1007/978-3-031-18283-9_31
• 发表时间: 2021
• 期刊: IACR Cryptol. ePrint Arch.
• 作者: Panagiotis Chatzigiannis;Foteini Baldimtsi;K. Chalkias

SoK: Auditability and Accountability in Distributed Payment Systems

• DOI: 10.1007/978-3-030-78375-4_13
• 发表时间: 2021
• 期刊: IACR Cryptol. ePrint Arch.
• 作者: Panagiotis Chatzigiannis;Foteini Baldimtsi;K. Chalkias