区块链环境下基于细粒度授权隐私保护的空间众包任务分配模型  

Blockchain-based Task Allocation Model on Fine-grained Privacy-preserving in Spatial Crowsourcing

作　　者：高丽萍[1,2] 程添 高丽[3] GAO Li-ping;CHENG Tian;GAO Li(School of Optical-Electrical Computer Engineering,University of Shanghai for Science&Technology,Shanghai 200093,China;Shanghai Key Laboratory of Data Science,Fudan University,Shanghai 200093,China;Library Department of Shanghai University of Technology,Shanghai 200093,China)

机构地区：[1]上海理工大学光电信息与计算机工程学院,上海200093 [2]复旦大学上海数据科学重点实验室,上海200093 [3]上海理工大学图书馆,上海200093

出　　处：《小型微型计算机系统》2022年第4期759-766,共8页Journal of Chinese Computer Systems

基　　金：国家自然科学基金项目(61572325,60970012)资助;上海重点科技攻关项目(14511107902,16DZ1203603)资助;上海智能家居大规模物联共性技术工程中心项目(GCZX14014)资助。

摘　　要：物联网蓬勃发展促使空间众包广泛应用,其任务分配主要依赖中心化平台,而中心化服务器一旦受到分布式拒绝服务攻击,众包系统将完全瘫痪.此外,在众包应用中,任务分配的合理性,高昂的平台服务费,隐私保护策略也需要同时考虑.本文提出了一种区块链环境下的空间众包任务分配模型.利用去中心化的区块链取代原有的中心化平台,构建了投标分数阈值动态变化的拍卖模型进行任务分配,同时基于密文策略的属性加密实现细粒度授权,加强任务内容的隐私保护.本文在私有链下使用真实数据集进行试验,并与现存的空间众包模型做了对比分析,实验结果表明,本文提出的模型在任务分配时总路径更短,花费成本更低,更具有合理性.With the vigorous development of Internet of Things,spatial crowdsourcing is widely used.Task allocation in spatial crowdsouring mainly depends on the centralized platform.Once the central server is attacked by distributed denial of service,the crowdsourcing system will break down.In addition,how to ensure the rationality of task allocation,reduce the high platform service fees and enhance privacy preserving need to be considered at the same time.This paper proposes a spatial crowdsourcing task allocation model in blockchain.The decentralized blockchain is used to replace the original centralized platform,and an auction model with dynamically changing bid score threshold is constructed for task allocation.At the same time,the CP-ABE realizes fine-grained authorization and strengthens the privacy protection of task content.In this paper,the real data set is used on private chain.Comparing with existing crowdsourcing models,the experimental results show that total distance is shorter and cost is lower in the proposed model which reveals rationality.

关 键 词：区块链 细粒度授权 隐私保护 众包任务分配 拍卖模型 

分 类 号：TP301[自动化与计算机技术—计算机系统结构]