The Access control scheme is an effective method to protect user data privacy.The access control scheme based on blockchain and ciphertext policy attribute encryption(CP–ABE)can solve the problems of single—point of...The Access control scheme is an effective method to protect user data privacy.The access control scheme based on blockchain and ciphertext policy attribute encryption(CP–ABE)can solve the problems of single—point of failure and lack of trust in the centralized system.However,it also brings new problems to the health information in the cloud storage environment,such as attribute leakage,low consensus efficiency,complex permission updates,and so on.This paper proposes an access control scheme with fine-grained attribute revocation,keyword search,and traceability of the attribute private key distribution process.Blockchain technology tracks the authorization of attribute private keys.The credit scoring method improves the Raft protocol in consensus efficiency.Besides,the interplanetary file system(IPFS)addresses the capacity deficit of blockchain.Under the premise of hiding policy,the research proposes a fine-grained access control method based on users,user attributes,and file structure.It optimizes the data-sharing mode.At the same time,Proxy Re-Encryption(PRE)technology is used to update the access rights.The proposed scheme proved to be secure.Comparative analysis and experimental results show that the proposed scheme has higher efficiency and more functions.It can meet the needs of medical institutions.展开更多
针对现有防篡改方法存在被篡改数据量过大、无法确保知识产权数据安全性的问题,引入区块链与改进密文策略属性基加密(Ciphertext Policy Attribute Based Encryption,CP-ABE)算法,开展对知识产权数据防篡改方法的设计研究。首先,利用区...针对现有防篡改方法存在被篡改数据量过大、无法确保知识产权数据安全性的问题,引入区块链与改进密文策略属性基加密(Ciphertext Policy Attribute Based Encryption,CP-ABE)算法,开展对知识产权数据防篡改方法的设计研究。首先,利用区块链技术创建知识产权数据智能合约,避免非法攻击者对其进行篡改;其次,利用改进CP-ABE算法控制知识产权数据细粒度访问,实现知识产权数据加密防篡改与授权访问;最后,进行实验分析。实验结果表明,应用该方法能够有效控制知识产权数据被篡改量,有利于保障知识产权拥有者的个人权益。展开更多
基金This research was funded by the National Natural Science Foundation of China,Grant Number 62162039the Shaanxi Provincial Key R&D Program,China with Grant Number 2020GY-041.
文摘The Access control scheme is an effective method to protect user data privacy.The access control scheme based on blockchain and ciphertext policy attribute encryption(CP–ABE)can solve the problems of single—point of failure and lack of trust in the centralized system.However,it also brings new problems to the health information in the cloud storage environment,such as attribute leakage,low consensus efficiency,complex permission updates,and so on.This paper proposes an access control scheme with fine-grained attribute revocation,keyword search,and traceability of the attribute private key distribution process.Blockchain technology tracks the authorization of attribute private keys.The credit scoring method improves the Raft protocol in consensus efficiency.Besides,the interplanetary file system(IPFS)addresses the capacity deficit of blockchain.Under the premise of hiding policy,the research proposes a fine-grained access control method based on users,user attributes,and file structure.It optimizes the data-sharing mode.At the same time,Proxy Re-Encryption(PRE)technology is used to update the access rights.The proposed scheme proved to be secure.Comparative analysis and experimental results show that the proposed scheme has higher efficiency and more functions.It can meet the needs of medical institutions.
文摘针对现有防篡改方法存在被篡改数据量过大、无法确保知识产权数据安全性的问题,引入区块链与改进密文策略属性基加密(Ciphertext Policy Attribute Based Encryption,CP-ABE)算法,开展对知识产权数据防篡改方法的设计研究。首先,利用区块链技术创建知识产权数据智能合约,避免非法攻击者对其进行篡改;其次,利用改进CP-ABE算法控制知识产权数据细粒度访问,实现知识产权数据加密防篡改与授权访问;最后,进行实验分析。实验结果表明,应用该方法能够有效控制知识产权数据被篡改量,有利于保障知识产权拥有者的个人权益。
