CT-ISG: Reconciling Accountability with Anonymity in P2P Systems

安娜Lysyanskaya布朗大学CT-ISG：在对等系统中用匿名来消除问责制小组：P060979摘要该项目构建了对等系统，在该系统中，对等体被激励诚实地为系统做出贡献，但仍然保持匿名。 电子现金（e-cash）被用作一种追踪机制，在不牺牲隐私的情况下实现问责制。电子现金与实物硬币的不可追踪性相匹配：同一家银行负责将电子现金分发给买家，并随后接受卖家的存款，但它无法追踪买家如何花钱。因此，电子现金非常适合作为P2P系统中的货币：隐私是许多p2p应用程序的关键特性，例如洋葱路由和共享备份。2该项目结合了系统构建和密码学工作。 我们的出发点是紧凑的电子现金，这是一个PI的最新发明，它改进了以前方案的时间和空间要求。 此外，允许卖家快速证明他们提供销售的数据属性而不泄露数据本身的原语正在开发中。这些加密创新正在真实的分布式系统中部署，包括电子现金银行和p2p应用程序，如洋葱路由，共享下载，数据备份，这些系统中的创新围绕着合同的发展，合同定义了这些系统中对等体的交互。 合同保证买卖双方诚实地行事。这个项目促进了我们对具有自治成员的分布式系统的理解。这些系统需要激励同行提供服务，但这些激励措施必须提供不损害参与者的隐私。

Anna LysyanskayaBrown UniversityCT-ISG: Reconciling Accountability with Anonymity in Peer-to-Peer Systems0627553Panel: P060979AbstractThis project builds peer-to-peer systems in which peers are motivatedto honestly contribute to the system, yet remain anonymous. Anonymouselectronic cash (e-cash) is used as a tracking mechanism to allow foraccountability without sacrificing privacy.E-cash matches the untraceability properties of physical coins: thesame bank is responsible for dispensing e-cash to buyers, and forlater accepting it for deposit from sellers, and yet it cannot tracehow buyers spent their money.As a result, e-cash is ideally suited for serving as a currencyin p2p systems: privacy is a key feature of many p2p applications,such as onion routing and shared backup.This project combines systems-building and cryptography work. Ourstarting point is compact e-cash, a recent invention of one of thePIs, which improves upon the time and space requirements of previousschemes. In addition, primitives that allow sellers to quickly proveproperties of data that they offer for sale, without revealing thedata itself are being developed.These cryptographic innovations are being deployed in real distributedsystems, including the e-cash bank and p2p applications such as onionrouting, shared downloads, data backup, and distributed computation.Innovations in these systems surround the development of contractsthat define the interactions of peers in these systems. Contractsensure that buyers and sellers act honestly.This project advances our understanding of distributed system withautonomous members. These systems require incentives for peers torender services, yet these incentives must be provided withoutcompromising participant privacy.