面向公有区块链上的私有区块链的多权威属性加密方案  

Multi-authority attribute-based encryption scheme for private blockchain over public blockchain

作　　者：孙科硕 高海英 宋杨 SUN Keshuo;GAO Haiying;SONG Yang(Cryptography Engineering Institute,Information Engineering University,Zhengzhou Henan 450001,China)

机构地区：[1]信息工程大学密码工程学院,郑州450001

出　　处：《计算机应用》2024年第12期3699-3708,共10页journal of Computer Applications

基　　金：国家自然科学基金资助项目(61902428)。

摘　　要：区块链是一种结合分布式存储、共识机制和密码学原理等技术的新兴数据结构。针对公有链上的数据访问控制问题,提出一种面向公有区块链上的私有区块链(POP)的多权威属性加密(MA-ABE)方案。首先,构建依托公有区块链的私有区块链,并给出具体的数据隐私保护流程;其次,设计联合权威初始化算法以及联合密钥生成算法;最后,在随机预言机模型下,通过模拟挑战密文和用户私钥,使用基于判定性双线性Diffie-Hellman (DBDH)的假设证明所提方案满足静态安全性。实验结果表明,在保证安全性的前提下,所提方案能够抵抗针对主密钥的n-1方恶意权威下的合谋攻击。Blockchain is an emerging data structure that combines distributed storage,consensus mechanisms,principles of cryptography,and other technologies.Aiming at the problem of data access control on public blockchain,a Multi-Authority Attribute-Based Encryption(MA-ABE)scheme for Private blockchain Over Public blockchain(POP)was proposed.Firstly,the private blockchain based on public blockchain was constructed,and a specific data privacy protection process was given.Secondly,a joint authority initialization algorithm and a joint key generation algorithm were designed.Finally,the static security of the proposed scheme was proved by using the Decisional Bilinear Diffie-Hellman(DBDH)assumption through simulating the challenge ciphertext and the user private key under the random oracle model.Experimental results show that the proposed scheme can resist collusion attacks under parties of malicious authorities targeting the master key.

关 键 词：区块链 多权威属性加密 联合算法 静态安全性 合谋攻击 

分 类 号：TN918.1[电子电信—通信与信息系统]