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祝贺我们的论文被ACM TOIT接收!
Authors: Chao Lin, Debiao He, Sherali Zeadally, Xinyi Huang, Zhe Liu
Title: Blockchain-based Data Sharing System for Sensing-as-A-Service in Smart Cities
Journal: ACM Transactions on Internet Technology
Abstract: The sensing-as-a service (SaaS) model has been explored to address the challenge of intractability of managing a large number of sensors faced by future smart cities. However, how to effectively share sensor data without compromising confidentiality, privacy protection, and fair trading without third-parties, is one of critical issues that must be solved in the SaaS in smart cities. While blockchain shows promise in solving these issues, the existing blockchain-based data sharing (BBDS) systems are difficult to apply to SaaS in smart cities because of many unresolved issues such as requiring a customized blockchain, huge storage, communication and computation costs, and dependence on a third-party to achieve fair trading. We propose a BBDS system model with its security requirements before we present a concrete construction by combining $\Sigma$-protocol, Paillier encryption scheme, and any secure symmetrical encryption and signature schemes. To demonstrate the utility of our proposed BBDS system, we present a security analysis and compare our system with other solutions. We implement the prototype in Remix to analyze the gas cost and we conduct experiments to evaluate the communication and computation costs of the BBDS system using  symmetric encryption (advanced encryption standard (AES)) and a signature scheme (elliptic curve digital signature algorithm (ECDSA)).

摘要:“感知即服务”可被用于解决未来智慧城市管理大量传感器的难题,但如何在不牺牲机密性、隐私性和无需第三方交易公平性情况下实现传感器数据共享,是面向智慧城市“感知即服务”需要解决的重要问题。虽然区块链技术在解决该问题上具有巨大潜力,但已有的基于区块链数据共享系统难以应用于面向智慧城市“感知即服务”,主要存在定制区块链特殊需求、高存储或通信代价、高计算开销以及依赖可信第三方实现公平交易等问题。本文提出基于区块链数据共享系统模型及其安全需求,并结合Σ协议、Paillier加密方案以及任意安全的对称加密方案和签名方案设计实例。本文还通过安全性分析和性能分析对比论证了设计实例的可行性。
地址:湖北省武汉市武昌区珞珈山,武汉大学国家网络安全学院

Tel:13476843061   Fax:   Email:cszyb@whu.edu.cn (张宇波)