基于条件代理重加密的跨链数据共享方案  

Cross-chain data sharing scheme based on conditional proxy re-encryption

作　　者：薛庆水 孙晨曦 马海峰 谈成龙 张天昊 Xue Qingshui;Sun Chenxi;Ma Haifeng;Tan Chenglong;Zhang Tianhao(School of Computer Science&Information Engineering,Shanghai Institute of Technology,Shanghai 201418,China)

机构地区：[1]上海应用技术大学计算机科学与信息工程学院,上海201418

出　　处：《计算机应用研究》2023年第5期1324-1329,共6页Application Research of Computers

基　　金：国家自然科学基金资助项目(61672350,61170227);教育部基金资助项目(39120K178038,14YJA880033);国家社会科学基金资助项目(16BGL003)。

摘　　要：目前区块链大多属于异构链,信息孤岛问题严重,所以如何打破区块链垂直发展的封闭状态和实现链间互联互通一直是区块链的研究热点。针对联盟链之间数据共享难、互操作性差和存储压力大等问题,提出一种基于条件代理重加密的跨链数据共享方案。从各联盟链中选出高信用节点充当公证人并组成公证链,作为跨链共享的媒介;引入星际文件系统实现混合存储,减小存储压力;随机确定一位公证人作为代理者,执行条件代理重加密操作实现链间共享密文的状态转变;通过信用约束和激励策略,规范公证人的行为和提高各链节点参与数据共享的积极性。理论分析和实验结果表明,提出方案在跨链数据共享方面更安全可靠,具有较高的跨链交互效率和较低的存储开销。At present,most blockchain belongs to heterogeneous chain,and the problem of information island is serious.Therefore,how to break the closed state of vertical development of blockchain and realize inter-chain interconnection has been a research hotspot of blockchain.Aiming at the problems of difficult data sharing,poor interoperability and high storage pressure between alliance chains,this paper proposed a cross-chain data sharing scheme based on conditional proxy re-encryption.It selected high credit nodes from each alliance chain to act as notary and form a notary chain as the media of cross-chain sharing,introduced interplanetary file system to realize hybrid storage and reduce storage pressure,selected randomly a notary as agent who performed the conditional proxy re-encryption operation to realize the state transition of the shared ciphertext between chains,regulated the behavior of notary and improved the enthusiasm of each chain node to participate in data sharing through credit constraint and incentive strategy.Theoretical analysis and experimental results show that the proposed scheme is more secure and reliable in cross-chain data sharing,has higher cross-chain interaction efficiency and lower storage overhead.

关 键 词：区块链 跨链共享 公证链 条件代理重加密 随机确定 

分 类 号：TP309[自动化与计算机技术—计算机系统结构]