CAREER: Privacy Preserving Transactions with Accountability Extensions

职业：通过责任扩展保护交易隐私

• 批准号: 2143287
• 负责人: Foteini Baldimtsi
• 金额: $ 54.81万
• 依托单位: George Mason University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2022
• 资助国家: 美国
• 起止时间: 2022-07-01 至 2027-06-30
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2143287&HistoricalAwards=false
• 关键词: CAREER; Privacy; Preserving; Transactions; Accountability

The amount of digital data collected and handled electronically is constantly increasing and poses serious threats to user privacy. While a number of cryptographic mechanisms that enhance data privacy exist in the literature, they suffer from prohibitive computational and communication costs and do not offer accountability mechanisms. Without improvements in efficiency and addition of accountability mechanisms, it is unlikely that the so much needed privacy-preserving systems will be massively adopted. Towards the goal of bringing privacy-enhancing technologies closer to adoption, this project defines and constructs a number of new cryptographic building blocks such as new types of digital signatures, cryptographic accumulators and zero-knowledge proofs which are at the core of mechanisms used to enhance privacy. In order to build practical protocols, the project introduces new security relaxations and security models (such as user-device separation) while adhering to the principles of provable secure protocol design, and designs accountability mechanisms for different system participants without relying on trusted third parties and secret trapdoors. The research is organized under three main thrusts which focus on different application areas. Namely, the project investigates anonymous decentralized payments (blockchain based), anonymous authentication (via the use of anonymous credentials), and auditable multi-party computation (MPC) for specific functions. The performed research includes collaborations with Policy and Economics researchers in order to design meaningful accountability mechanisms and leverage blockchain incentives. The project provides education on fundamentals and practices of cryptography and privacy-preserving techniques to students with various backgrounds: from K-12 students to engineering and CS students, as well as policy students and senior executives studying at the MBA level.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

收集和以电子方式处理的数字数据数量不断增加，并对用户隐私构成了严重威胁。尽管文献中存在增强数据隐私的多种加密机制，但它们遭受了过度的计算和通信成本，并且不提供问责机制。如果没有提高效率和责任机制的提高，就不可能大量采用如此急需的隐私系统。为了使更接近采用的隐私技术的目标，该项目定义并构建了许多新的加密构建块，例如新型的数字签名，加密累积器和零知识证明，这些构建机构是用于增强隐私的机制的核心。为了构建实用协议，该项目在遵守可证明的安全协议设计原理的同时，介绍了新的安全放松和安全模型（例如用户设备分离），并为不同的系统参与者设计了责任机制，而无需依靠受信任的第三方和秘密的诱惑者。这项研究是在三个主要的推力下组织的，这些主要推力集中在不同的应用领域。也就是说，该项目研究了匿名分散付款（基于区块链），匿名身份验证（通过使用匿名凭证）以及可审核的多方计算（MPC）用于特定功能。进行的研究包括与政策和经济学研究人员的合作，以设计有意义的问责机制并利用区块链激励措施。该项目为具有各种背景的学生提供了有关密码学和隐私保护技术的基础和实践的教育：从K-12学生到工程和CS学生，以及在MBA级别学习的政策学生和高级高管。这项奖项反映了NSF的法定任务，并通过使用基金会的智力来评估了NSF的法定任务，并具有评估的支持。

项目成果

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