【摘要】 针对众包平台中存在的隐私泄露和平台欺诈等问题，提出基于区块链的众包访问控制方案。将区块链技术与属性基加密算法相结合，基于IPFS(inter planetary file system)对数据进行安全可靠的分布式存储，同时缓解区块链的存储负担；设计了一种基于区块链的可验证、可追溯访问控制方案，编写智能合约算法对密钥进行验证和分发，利用牛顿插值定理的数学特性实现恶意用户追溯。安全性分析和实验结果表明，方案实现了抵抗选择明文攻击、抗共谋攻击和恶意用户追踪等目标，且将重构多项式的时间开销降低至O(n)。更多还原

【Abstract】 Aiming at the problems of privacy leakage and platform fraud in crowdsourcing platform, a blockchain-based crowdsourcing access control scheme was proposed. Secure and reliable distributed data storage based on the InterPlanetary File System(IPFS) was enabled by the scheme through the integration of blockchain technology with an attribute-based encryption algorithm, while blockchain storage burdens were simultaneously alleviated. A verifiable and traceable access control scheme based on blockchain was designed, a smart contract algorithm was implemented to realize the verification and distribution of keys, and malicious user tracing was realized by the mathematical properties of Newton interpolation theorem. The security analysis and experimental results show that the proposed scheme achieves the goals of resisting chosen plaintext attacks, collusion attack and malicious user tracing, and reduces the time cost of reconstruction polynomial to O( n).更多还原