Decentralized Crowdsourcing atop Open Blockchain

时间:7月10日下午14:30

地点: 计算机学院B405

报告简介:Tremendous real-world incidents, such as Apple’s leakage and Uber’s breach, make it increasingly important to decentralize Web applications atop blockchain to reduce the resilience on third-party. Decentralized crowdsourcing is one of the most attractive decentralized apps. But the blockchain is transparently replicated across the untrusted Internet, and will not hide any secret. So private data and identities might leak via the blockchain, in the use-case of decentralized crowdsourcing, which is quite arguable for basic utilities. ZebraLancer therefore is designed and implemented to overcome these two main challenges of decentralizing, i.e. data leakage and identity breach. Our outsource-then-prove methodology resolves the critical tension between blockchain transparency and data confidentiality without sacrificing the fairness of exchange: a requester will not pay more than what data deserve, according to a quality-aware policy announced through the blockchain; each worker indeed gets a payment based on their data quality, if submitting data to the chain; and, all crowd-shared data will be confidential to the blockchain network. Furthermore, ZebraLancer solves the problem of identity breach, by allowing anonymous participations without surrendering user accountability: if one authenticates twice in a task contract, everybody can tell, or else staying fully anonymous. To realize such delicate linkability within tasks, we put forth a novel cryptographic notion, the common-prefix-linkable anonymous authentication.In this talk, the design rationale, newly proposed cryptographic primitive, and implementation subtleties behind decentralized crowdsourcing framework will be discussed. The main results of this work will appear in IEEE ICDCS 2018.

报告人简介: Mr. Yuan Lu is a Ph.D. candidate in New Jersey Institute of Technology, advised by Prof. Qiang Tang. He received his B.Sc. and B.B.A degrees from Nankai University and Tianjin University in 2011, respectively. He received his master degree in electrical engineering from Nankai University in 2014, with the honours of excellent graduated student and excellent thesis. His current research work focuses on decentralized Web applications, applied cryptography, and game-theoretic security in decentralized scenarios. He served as reviewer of IEEE Transaction on Mobile Computing, IEEE Transactions on Information Forensics and Security, INFOCOM’17, INFOCOM’18, IPCCC’16, ICNC’18, ACISP’18, ICNSC’18, APKC’18, Blockchain’18, ICCCS’18, AsiaCrypt’18.

邀请人：王骞教授